CN105462638A - Method and apparatus for producing natural gas through combination of crushed coal pressurization gasification and coal water slurry gasification - Google Patents
Method and apparatus for producing natural gas through combination of crushed coal pressurization gasification and coal water slurry gasification Download PDFInfo
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Abstract
The present invention provides a method and an apparatus for producing natural gas through combination of crushed coal pressurization gasification and coal water slurry gasification. According to the present invention, two pressurization gasification processes such as crushed coal pressurization gasification and coal water slurry gasification are organically combined, wherein wastewater containing phenol, tar, medium oil and the like and produced due to crushed coal pressurization gasification is added to a coal water slurry gasification furnace to produce a multi-component mixing slurry containing coal, oil and water, such that the water required by the gasification process is more close to the water vapor required by the gasification reaction process condition, the effective reactant concentration of the slurry added to the furnace is increased, the contents of CO and H2 in the reacting coal gas are improved, the consumptions of oxygen and raw material coal are reduced, the energy consumption is reduced, the scale of the subsequent CO conversion, acid gas removal and methanation device can be reduced, the part of the investment can be saved, and the economic benefits can be improved; and with the method and the apparatus, the sewage treatment problem is solved, the scientific and rational utilization direction of the remaining coal powder after the crushed coal pressurization gasification is solved, and the coal-to-natural-gas yield is ensured in the case of no additional investment, such that the optimized process route of the coal-to-natural-gas is provided.
Description
Technical field
The invention belongs to coal preparing natural gas technical field.Particularly, the present invention relates to method and device that a kind of crushed coal pressure gasifying associating coal water slurry gasification produces Sweet natural gas.
Background technology
On current market, the feature of Chinese Resources is " rich coal, oil starvation, weak breath ".Economy-zone is huge to Natural Gas Demand greatly for Circum-Bohai Sea, the Yangtze River Delta, Pearl River Delta three, and the ground such as the Inner Mongol, Xinjiang rich coal resources, transportation cost is high.Therefore, the coal resources in rich coal area are changed into Sweet natural gas on the spot, the another grand strategy become after coal generating, coal liquifaction, olefin hydrocarbon making by coal is selected.The project Just in Times such as coal liquifaction, olefin hydrocarbon making by coal, coal preparing natural gas are that state key supports Coal Chemical Engineering Project.But for the selection of operational path in evolution, especially the type selecting of vapourizing furnace and the selection aspect of gasification mode are the focuses of expert, the debate within the scholars always, adopt which kind of type of furnace and gasification mode more science, reasonable, economic, more effectively realize the emphasis of energy-saving and emission-reduction Shi Ge scientific research institutions research.
The whole technological process of production of coal preparing natural gas can be sketched and be: the high purity oxygen gas that feed coal comes with air separation facility in coal gasification apparatus and middle pressure steam obtain raw gas through the reaction in furnace that gasifies; Raw gas, after resistant to sulfur oil resistant conversion cooling and low temperature washing device for methanol desulfurization and decarburization, makes required purified gas; Purified gas enters methanation device synthesizing methane, produces the Sweet natural gas of high-quality; Produce rich hydrogen sulfide containing sour gas from refining plant and deliver to Sulfur Recovery Unit and ammonia desulfuration equipment processes, produce sulphur; In the gas liquor that gasification produces, detrimental impurity is by the process of phenol ammonia recovery unit, waste water after materializing strategy, biochemical treatment, advanced treatment and part film process, and waste water is recycled.
Crushed coal pressure gasifying introduces First vapourizing furnace from Tian Ji group the eighties in last century, pacifies coal-based synthetic oil company gasification installation to Shanxi the Lushui River, and domestic safe and stable operation nearly hundred vapourizing furnaces, for the development of Modern Coal-based Chemical is had laid a good foundation.Coal water slurry gasification successfully introduces first set gasification installation from Unit at Lunan Chemical Fertilizer Plant in 1987, to four nozzles, multi-nozzle coal slurry gasifier that today, China independently created, domestic operation is over one hundred vapourizing furnace nearly, and vapourizing furnace throughput is increasing, and the cycle of operation sets a new record repeatly.Visible crushed coal pressure gasifying, coal water slurry gasification are two kinds of gasification modes that domestic device is maximum, operation is the most steady, target product is the widest.
Crushed coal pressure gasifying technique belongs to moving-bed gasification technology.Take granularity as 5-50mm coal be raw material, water vapour and pure oxygen are vaporized chemical, in the vapourizing furnace of 3.0-4.1MPa, carry out countercurrent reaction, produce CH
4the raw gas of content 12-15%.Because of its mature technology, single stove gas production rate is large, the high-moisture that can gasify, high-ash low grade coal, at home widespread use.Containing a large amount of CH in this technique synthetic gas
4, for being that raw material production town gas is favourable with coal; The byproduct that gasification produces is as better in the market economic worth after deep processing such as phenol, tar, mainly for the production of the main production line of coal synthetic oil, coal preparing natural gas.But its shortcoming is:
(1) because gasification temperature is lower, after gasification, in coal gas, a large amount of tar, phenol, ammonia and C is contained
nh
mcomponent, must arrange tar removing, phenol, ammonia and C in its operational path
nh
mthe retrieving arrangement of component, and this part retrieving arrangement flow process is complicated, and energy consumption is higher.
(2) press through hot steam undecomposed utilization in vapourizing furnace in a large amount of, high-grade steam becomes low-grade steam, and energy utilization efficiency is low, in press through hot steam and need the boiler of configuration more, general facilities investment is higher.
(3) gasify thus and the wastewater flow rate that produces is large, waste water complicated, itself BOD and COD very high concentrations, wastewater treatment is extremely difficult, will be larger to severe cold area difficulty.
(4) available raw coal size is 5-50mm, and the fine coal of about 50% needs to re-use, and feed coal utilization ratio is low.
(5) gas liquor be separated and phenol ammonia recovery unit floor space large.The mode of general employing chemical industry process (settlement separate, stripping-extraction) and biochemical treatment, treatment process long flow path, cost for wastewater treatment is high, deficiency in economic performance, and one-time investment is comparatively large, restricts it and applies.
Coal water slurry gasification flow process belongs to wet entrained flow bed gasification technology.Vapourizing furnace is sent into by nozzle together with vaporized chemical by the form of the solid carbon such as coal or refinery coke hydrogen compound and coal water slurry or water carbon slurry, vaporized chemical sprays at a high speed with slip and flows atomization, in vapourizing furnace, carry out the technological process of flame type non-catalytic partial oxidation reaction, the high-temperature gas of discharging by combustion chamber and slag are divided into chilling process and pot destroying process because of the difference of the type of cooling.Contain the small organic molecule such as tar, phenol hardly in the waste water of coal slurry gasifier because of High Temperature High Pressure gasification generation, a small amount of waste water can directly discharge after simple biochemical treatment.There is the advantages such as gasified raw material scope is wider, gasification is polluted less, good environmental protection.CO and H in the gas composition of coal water slurry gasification
2content 80%, synthetic gas productivity ratio is higher, mainly for the production of the product such as synthetic ammonia, synthesizing methanol.
Coal water slurry gasification flow process is specifically: 1) coal-grinding slurrying.The broken coal come by coal storage system, through being metered into coal mill, mixing with a certain amount of process water, wears into the coal water slurry of certain particle size distributed density in coal mill.Vapourizing furnace is delivered to through the pressurization of coal slurry feeding pump.2) coal water slurry gasification.Coal slurry and sky oxygen of assigning to sprays in stove by top of gasification furnace through nozzle, carries out partial oxidation reaction and generate raw gas under 1400 DEG C of conditions.After reacted raw gas flows through the shock chamber's Quench bottom vapourizing furnace together with slag, make gas and solid slag separately.Slag is discharged by bottom vapourizing furnace after being solidified by Quench.The raw gas of high temperature is lowered the temperature through Quench, and heat is passed to water, produce a large amount of saturated vapors, the gas mixture of raw gas and water vapor sends vapourizing furnace simultaneously, then through two-stage washing, the gas phase separation in gas mixture out, send shift conversion step.3) water treatment.Coal water slurry preparation need consume the neutral water of a large amount of pH value 6-8.In prior art, in order to the recycle of water, the Heisui River after Heisui River and washing raw gas will be come from vapourizing furnace shock chamber, after multistage flash evaporation removing dissolved gases, through sedimentation the thin slag in Heisui River separated again and be processed into filter cake and send outside, remaining processed water is buck, and row except a small amount of, major part returns gasification unit and recycles.Its water treatment cost power consumption cost is huge.
Summary of the invention
Therefore, the present invention aims to provide a kind of integration technology scheme, solves wastewater treatment of the prior art and water treatment energy consumption issues.Particularly, one object of the present invention is, provides a kind of method of crushed coal pressure gasifying and coal water slurry gasification combination producing Sweet natural gas.Another object of the present invention is, provides the device of a kind of crushed coal pressure gasifying and coal water slurry gasification combination producing Sweet natural gas.Another object of the present invention is, provides a kind of Sweet natural gas produced by described crushed coal pressure gasifying and coal water slurry gasification combine production method.
For above goal of the invention, the invention provides following technical scheme:
On the one hand, the invention provides a kind of method of crushed coal pressure gasifying and coal water slurry gasification combination producing Sweet natural gas, described method comprises crushed coal pressure gasifying and the operating process of coal water slurry gasification two portions simultaneously, wherein:
Described crushed coal pressure gasifying operation employing moving-bed gasification mode take preferred size as 13-50mm coal is raw material, and water vapour and pure oxygen are vaporized chemical, in the vapourizing furnace of preferred 3.0-6.0MPa, carry out countercurrent reaction, produce raw gas;
Described coal water slurry gasification flow process adopts wet entrained flow bed gasification mode, to gasify together with vaporized chemical production raw gas by the form of the solid carbon such as coal or refinery coke hydrogen compound and coal water slurry or water carbon slurry, comprise: 1) coal-grinding slurrying, 2) coal water slurry gasification, with 3) water treatment procedure, preferably, by percentage to the quality, prepare coal water slurry containing coal 58-65%, water 20-30% and lignosulfonic acid salt additives 0.2-0.3%, viscosity of coal slurry 600-1200mPa.s, the weight ratio of coal water is 3:2; Further preferably, described water coal slurry concentration mass percent controls 60%; Further, the waste water produced in described crushed coal pressure gasifying process is used for preparing the coal water slurry needed for described coal water slurry gasification process, then carries out coal water slurry gasification reaction.
According to the method for producing Sweet natural gas as previously mentioned, preferably, the waste water produced in described crushed coal pressure gasifying process comprises: the processed waste water containing phenol, tar, middle wet goods that the waste water of crushed coal pressure gasifying preliminary treatment and/or crushed coal pressure gasifying produce; Further preferably, the waste water produced in described crushed coal pressure gasifying process also comprises: the PH that the processed waste water that described crushed coal pressure gasifying produces produces after the flash distillation of gas liquor tripping device and gravity separation, depickling, deamination is the waste water of 6.0-8.0.
According to the method for producing Sweet natural gas as previously mentioned, preferably, the closed cycle in coal water slurry preparation process of described waste water uses, and more preferably, in described waste water, total phenol content is 4000-10000mg/l, always ammonia content is 100-300mg/l.
According to the method for producing Sweet natural gas as previously mentioned, preferably, the ature of coal of described pressurized gasification is low-rank coal, preferred old brown coal and bituminous coal; 13-50mm lump coal, after screening, is sent into crushed coal pressurized-gasification furnace by raw coal, and the classified grinding slurrying of fine coal is used for water coal slurry pressure gasification.
According to the method for producing Sweet natural gas as previously mentioned, preferably, the described method Lowlevel thermal energy steam preheating coal water slurry that utilizes crushed coal pressure gasifying technique to produce; Further preferably, described method also comprises the reaction heat being recovered in gasification in Sweet natural gas preparation process, conversion and methanation device and releasing, and comes preheat boiler-feed-water, de-salted water and/or condensed water respectively by heat exchange byproduct steam and low this reaction heat of potential energy UTILIZATION OF VESIDUAL HEAT IN.
According to the method for producing Sweet natural gas as previously mentioned, preferably, the steam of described water coal slurry pressure gasification institute by-product is used for crushed coal pressure gasifying and phenol ammonia recovery unit.
According to the method for producing Sweet natural gas as previously mentioned, preferably, described broken coal vapourizing furnace production run oxygen load 4000-9000NM
3/ h, raw gas temperature out 225-600 DEG C, working pressure 3.0-6.0MPa, steam oxygen ratio is 5.0-8.0Kg/NM
3; And/or
Described coal slurry gasifier oxygen load 10000-15000NM
3/ h, oxygen coal is than 0.7-1.2kg/kg dry coal, and it is more than 4000Kcal/kg that as-fired coal calorific value requires, working pressure 3.0-8.0MPa.
According to the method for producing Sweet natural gas as previously mentioned, preferably, after described crushed coal pressure gasifying and coal water slurry gasification two portions operating process two kinds of raw gas mixing, the conversion bed temperature of carbon monoxide controls at 220-430 DEG C, the span of control 2.9-3.1 of methanation reaction hydrogen-carbon ratio.
On the other hand, the invention provides a kind of device for combination producing natural gas method as previously mentioned, described device comprises crushed coal pressurized-gasification furnace and wet entrained flow bed gasification furnace, wherein:
Described crushed coal pressurized-gasification furnace adopts liquid or dry ash extraction mode, direct depended on pressure conveying or power conveying, and the waste water of discharging needs gas liquor separation, phenol ammonia recovery unit or biochemical treatment, and discharged producer gas temperature is about 225-600 DEG C;
Described wet entrained flow bed gasification furnace is that pure oxygen cooks vaporized chemical with coal slurry charging, slag tap, and gasification flame kernel temperature is between 1400-2200 DEG C, and discharged producer gas temperature is about 1400-1700 DEG C.
Again on the one hand, the invention provides the Sweet natural gas according to method production as previously mentioned.
The crushed coal pressure gasifying process portion that the present invention adopts belongs to moving-bed gasification technology.Take granularity as 13-50mm coal be raw material, water vapour and pure oxygen are vaporized chemical, in the vapourizing furnace of 3.0-6.0MPa, carry out countercurrent reaction, produce CH
4the raw gas of content 12-15%.The coal-water slurry gasification part that the present invention adopts belongs to wet entrained flow bed gasification technology.Vapourizing furnace is sent into by nozzle together with vaporized chemical by the form of the solid carbon such as coal or refinery coke hydrogen compound and coal water slurry or water carbon slurry, vaporized chemical sprays at a high speed with slip and flows atomization, in vapourizing furnace, carry out the technological process of flame type non-catalytic partial oxidation reaction, the high-temperature gas of discharging by combustion chamber and slag are divided into chilling process and pot destroying process because of the difference of the type of cooling.
The present invention adopts crushed coal pressure gasifying and coal water slurry Coal Gasification Technology to carry out coproduction and produces coal preparing natural gas, and postorder CO conversion, acid gas removal and methanation device scale reduce, and can save large number quipments and material investment.
Particularly, the present invention obtains technical scheme and solves following technical problem:
1. the waste water complicated of crushed coal pressure gasifying preliminary treatment, wastewater treatment is extremely difficult, process and running cost higher, this scheme for combining utilizes this effluent part to send into the preparation of water coal slurry pressure gasification process for coal water slurry, crushed coal pressure gasifying processing wastewater treatment scale can be reduced, reduce wastewater treatment difficulty, significantly reduce wastewater treatment investment, save cost for wastewater treatment, improve Project Economy Benefit.
2. the processed waste water containing phenol, tar, middle wet goods utilizing crushed coal pressure gasifying to produce, prepares coal water slurry by Mill Systems, then carries out gasification reaction, is added to the effecting reaction substrate concentration of furnace charge slurry, improves CO+H in reaction coal gas
2content, reduce the consumption of oxygen and feed coal, reduction energy consumption is also increased economic efficiency.
3. raw coal is after screening, and broken coal send pressurized gasification to adopt block low order brown coal hydrogasification, and the classified grinding slurrying of fine coal is used for water coal slurry pressure gasification, improves the utilization ratio of feed coal, reduces running cost, improves project whole economic efficiency.
4. a large amount of steam of water coal slurry pressure gasification by-product may be used for crushed coal pressure gasifying and phenol ammonia recovery unit, and full factory steam utilization efficiency is higher, and general facilities investment is relatively less.
5. the Lowlevel thermal energy steam preheating coal water slurry utilizing crushed coal pressure gasifying technique to produce, can improve coal water slurry and enter stove latent heat, effectively utilize Lowlevel thermal energy, reduces oxygen consumption;
6. the waste water containing the material such as tar and phenol decomposes completely in coal slurry gasifier, reduces cost for wastewater treatment, good in economic efficiency;
7. water-coal-slurry slurring flow process consumes a large amount of waste water that broken coal pressurization produces, reduce the fresh water consumption of pulping process, the investment of crushed coal pressure gasifying biochemical equipment and production and operation cost can be reduced, by the closed cycle of waste water, can realize wastewater zero discharge, social benefit is good.
Further, technical scheme of the present invention is adopted to obtain following technique effect:
1, have employed crushed coal pressure gasifying Technology, the CH in unstripped gas
4content 12-15%, combine coal water slurry gasification technology, by regulating two sections of coal water slurry chargings, carbonated drink ratio can realize CH in synthetic gas simultaneously
4content reaches the adjustment of 8%; Decrease the loss of methane resulting load and Conversion of energy, energy efficient;
2, the huge investment of phenol ammonia recovery unit, biochemical sewage treatment device in crushed coal pressure gasifying chemical-process is solved.Reduce extraction, solvent recuperation in gas liquor chemical-process, the running cost of biochemical treatment flow process;
The technique of the inferior grade steam heating coal water slurry 3, adopting crushed coal pressure gasifying to produce, can improve coal water slurry and enter stove latent heat, effectively utilize Lowlevel thermal energy; Utilize a large amount of steam of water coal slurry pressure gasification by-product for crushed coal pressure gasifying and phenol recovery etc., improve full factory steam utilization efficiency high;
4, decrease the slurrying problem of water consumption of a large amount of coal water slurry gasification, relative water supply auxiliary facility investment cost significantly reduces.Crushed coal pressure gasifying waste water handling problem obtains effective solution, finds again a wastewater treatment new way, can realize zero discharge of industrial waste water;
5, participate in second gasification containing phenol, tar and waste water, improve vaporized carbon transformation efficiency;
6, gasification, conversion and methanation device have a large amount of reaction heat to release, take synthetical recovery heat system, utilize reaction heat respectively by heat exchange byproduct steam and utilize low potential energy waste heat, preheat boiler-feed-water, de-salted water, condensed water, to improve the utilising efficiency of system thermal;
7, in kinds of coals for gasification selection, mainly adopt low order brown coal, reduce raw materials cost;
8, along with the strict demand that country discharges wastewater from chemical industry, environmental protection chemical production device of forbidding not up to standard runs or builds Coal Chemical Engineering Project again, makes this process environments benefit increasingly significant.
Finally, technical scheme of the present invention has vast potential for future development:
First, for coal resources in China feature, low-rank coal reserves are very abundant, in addition massive mechanical coal-mining technique development and apply, utilize crushed coal pressure gasifying and coal water slurry gasification combination technique to be comply with the needs meeting large-scale Coal Chemical Engineering Project and develop.The present inventor drops into through a large amount of pre-stage tests and personnel's material, research has drawn method of the present invention and device scheme, this operational path is mainly applicable to low order brown coal and send vapourizing furnace after screening, drying, combination producing coal-based gas, shape of depositing cash composed by the coal resources being particularly useful for China, and the low-rank coal such as brown coal and long-flame coal is contained than more rich present situation.For the central and west regions that water resources is poorer, develop large-scale Coal Chemical Engineering Project, seem more competitive.
Secondly, present invention achieves broken coal gasification and coal water slurry gasification combination producing, production adjustment capability is strong, can realize production safety steady running, enhance productivity.Further, eliminate the phenol recovery ammonia in wastewater treatment chemical-process and biochemical treatment apparatus, floor space is relatively little.CH is contained in crushed coal pressure gasifying technology coal gas
4about 12-15%, steam decomposition rate is low, and produce phenolic wastewater many, cost for wastewater treatment is high; Hardly containing CH in coal water slurry gasification technology coal gas
4, the problems such as the process water of certain proportioning, additive and solubility promoter are needed when coal slurry is in harmonious proportion.Crushed coal pressure gasifying waste water is used as coal water slurry Blending water, by crushed coal pressure gasifying and coal-water slurry gasification coproduction, postorder CO conversion, acid gas removal and methanation device share, produce coal-based gas, realize two groups of gasifying process associatings complementary, what namely expand coal utilizes scope, reduces waste disposal plant construction investment and production maintenance expense again, thus reduction production cost, the maximization of effective guarantee device, serialization stably manufactured.
3rd, the present invention compared with the prior art, on the basis ensureing crushed coal pressure gasifying technology and wet entrained flow bed gasification technology process advantage separately, the waste water containing phenol, tar, middle oil that crushed coal pressure gasifying produces is added in coal water slurry preparation, not only meet the needs of coal water slurry gasification technology, and reducing the processing cost of crushed coal pressure gasifying technology stain disease, postorder CO conversion, acid gas removal and methanation device reduce scale.
Accompanying drawing explanation
Below, describe embodiment of the present invention in detail by reference to the accompanying drawings, wherein:
Fig. 1 describes the schematic flow sheet that crushed coal pressure gasifying of the present invention associating coal water slurry gasification produces the method for Sweet natural gas and an embodiment of device.
Embodiment
The present invention is illustrated further below by embodiment.Should be understood that, these embodiments are only used for illustrating in greater detail the present invention, and are not used in and limit the present invention in any form.
Unless otherwise noted, in embodiment, general description is carried out to the material used in the present invention's test and test method.Although for realizing many materials that the object of the invention uses and working method is well known in the art, the present invention still describes in detail as far as possible at this.
Particularly, in embodiment, wet entrained flow bed gasification technology comprises multi-nozzle opposed Coal Gasification Technology, the water coal slurry pressurized gasification technology of Texaco Development Corporation of the U.S., the two-part coal water slurry gasification technology etc. of Dow Chemical Company of Tsing-Hua University's stove gasification technology of Chinese Tsing-Hua University, East China University of Science and Yanzhou Mining Group.
embodiment 1
Schema shown in Figure 1, the present embodiment describes crushed coal pressure gasifying of the present invention associating coal water slurry gasification and produces the method for Sweet natural gas and an embodiment of device.
First, in crushed coal pressurized-gasification furnace, coal and vaporized chemical are under 4.1MPa pressure, and counter current contact carries out gasification reaction.Particularly, raw material brown coal are through fragmentation, after screening, the broken coal of 13-50mm is fed in vapourizing furnace coal bunker by coal conveyer belt, coal passes through coal bunker, the coal lockup period of coal charge chute through being arranged on top of gasification furnace adds vapourizing furnace, coal in vapourizing furnace in decline process with vaporized chemical counter current contact, coal is from top to bottom through drying layer, destructive distillation layer, methane layer, gasification layer and ash bed, the ash that generation carbon content is about 5-7% enters ash lock by fire grate rotation, timing enters ash-transmission system, the washing slag water utilizing pressure to be about 0.7MPa by lime-ash discharged to slag bath, after slag is dragged in grab bucket, automobile is transported outward.Containing CH
4content is discharged by top scrubber cooler at the raw gas of about 12%, with the washing of high pressure spraying gas liquor in scrubber cooler, the impurity such as dirt, tar in removing coal gas, temperature drops to 205 DEG C, be cooled to 180 DEG C in waste heat boiler after, be sent to raw gas conversion cooling job number.
Raw gas produces phlegma at waste heat boiler, and most is circulated between scrubber cooler and waste heat boiler water leg by recycle pump, about 199 DEG C of another part is sent to gas liquor separation job number by discharge at the bottom of still, 70 DEG C are dropped to successively through waste-heat recoverer, gas liquor cooling temperature, enter gas liquor expander and carry out expansion flash distillation, the gas dissolved CO in removing gas liquor
2and H
2s, pressure enters oil separator successively after reducing and carries out settlement separate, separates the impurity such as coal tar, oil and dirt, carries out gravity settling, make oil, water, dirt three phase separation at this, and oil is outer after entering oil groove collection by overflow line to be sold.Gas liquor enters two medium filter and removes dust wherein and tar further, and deliver to extracting tower, deammoniation tower through gas liquor sump pump, the sour gas in this removing gas liquor and ammonia, weak ammonia sends production thiamines.The pH value of gas liquor is down to about 7.0 simultaneously, and deamination tower reactor ground coal air water, close to neutral water, can directly send coal water slurry gasification as slurrying water.The low-pressure steam of waste heat boiler shell side by-product is to the preheating of coal water slurry coal mill system.
Through fragmentation, the raw material coal of coal as coal water slurry of 5mm is less than after screening, through gas liquor and brown coal, additive and solubility promoter enter coal pulverizer according to a certain percentage together, make the coal water slurry of concentration about 60%, and (coal water slurry can be improved with the low-pressure steam heating water coal slurry that crushed coal pressure gasifying device waste heat boiler produces and enter stove latent heat, reduce oxygen consumption), coal slurry enters vapourizing furnace through technique nozzle, temperature 1400 DEG C, gasification reaction is carried out under pressure 3.9-4.2MPa, complete drying instantaneously, cracking, burning and gasification reaction, the organism in gas liquor is made to change into raw gas, hardly containing CH in coal gas
4.A large amount of steam that coal slurry gasifier produces can go phenol ammonia tower reactor as heating steam.Raw gas is after Venturi tube, water wash column cool to 210-240 DEG C, the coal gas produced with crushed coal pressure gasifying mixes, jointly enter middle temperature sulphur tolerant CO shift system, the ratio of carbon monoxide and hydrogen in adjustment raw gas, conversion gas is with pressure 3.0-3.5MPa, temperature about 40 DEG C enters low temperature washing device for methanol, in this oil removing, desulfurization, decarburization, changes into purified gas (required cold is provided by ammonia compression refrigerating apparatus).Purified gas sends into two-stage methanator synthesizing methane (first order reaction pressure 2.9-3.0MPa, temperature 550-620 DEG C, second order reaction 2.4-2.8MPa, temperature 300-400 DEG C), eventually passes cooling, dry rear generation contains CH
4be the coal-based gas of more than 94%, after compression, send into gas distributing system.
embodiment 2
By processing method described in above embodiment 1, to produce 400 × 10 daily
4nm
3natural Gas Projects calculates, and economic benefit situation is as follows:
(1) cost of investment:
Adopt gas liquor to be separated and depickling deammoniation tower combination process, decrease phenol and reclaim most of device (about 70%) and biochemical sewage treatment device and invest (comprising equipment purchasing, installation work and construction work) 1.78 hundred million yuan.
(2) year productivity effect:
Crushed coal pressure gasifying Wastewater Pretreatment running cost about 30 yuan/t waste water × 30t/h stove × 8000 hour=7,200,000 yuan.
With 16 gasification furnace gauges 7,200,000 × 16=1.152 hundred million yuan, year saves waste water operation cost 1.152 hundred million yuan, and economic benefit is very considerable.
Although inventions have been description to a certain degree, apparently, under the condition not departing from the spirit and scope of the present invention, one of ordinary skill in the art can carry out the suitable change of each condition.Should be appreciated that the present invention is not limited to embodiment as herein described.The scope of the claims in the present invention, it is when the equivalent replacement comprising one of ordinary skill in the art's each factor described in one's power.
Claims (11)
1. a method for crushed coal pressure gasifying and coal water slurry gasification combination producing Sweet natural gas, is characterized in that, described method comprises crushed coal pressure gasifying and the operating process of coal water slurry gasification two portions simultaneously, wherein:
Described crushed coal pressure gasifying operation employing moving-bed gasification mode take preferred size as 13-50mm coal is raw material, and water vapour and pure oxygen are vaporized chemical, in the vapourizing furnace of preferred 3.0-6.0MPa, carry out countercurrent reaction, produce raw gas;
Described coal water slurry gasification flow process adopts wet entrained flow bed gasification mode, to gasify together with vaporized chemical production raw gas by the form of the solid carbon such as coal or refinery coke hydrogen compound and coal water slurry or water carbon slurry, comprise: 1) coal-grinding slurrying, 2) coal water slurry gasification, with 3) water treatment procedure, preferably, by percentage to the quality, prepare coal water slurry containing coal 58-65%, water 20-30% and lignosulfonic acid salt additives 0.2-0.3%, described viscosity of coal slurry is 600-1200mPa.s, and the weight ratio of coal water is 3:2; Further preferably, in described coal water slurry, the mass percent concentration of coal controls 60%;
Further, the waste water produced in described crushed coal pressure gasifying process is used for preparing the coal water slurry needed for described coal water slurry gasification process, then carries out coal water slurry gasification reaction.
2. produce the method for Sweet natural gas as claimed in claim 1, it is characterized in that, the waste water produced in described crushed coal pressure gasifying process comprises: the processed waste water containing phenol, tar, middle wet goods that the waste water of crushed coal pressure gasifying preliminary treatment and/or crushed coal pressure gasifying produce.
3. produce the method for Sweet natural gas as claimed in claim 2, it is characterized in that, the waste water produced in described crushed coal pressure gasifying process also comprises: the PH that the processed waste water that described crushed coal pressure gasifying produces produces after the flash distillation of gas liquor tripping device and gravity separation, depickling, deamination is the waste water of 6.0-8.0.
4. as described in Claims 2 or 3, produce the method for Sweet natural gas, it is characterized in that, the closed cycle in coal water slurry preparation process of described waste water uses, and preferably, in described waste water, total phenol content is 4000-10000mg/l, always ammonia content is 100-300mg/l.
5. as described in any one of claim 1-4, produce the method for Sweet natural gas, it is characterized in that, the ature of coal of described pressurized gasification is low-rank coal, preferred old brown coal and bituminous coal; 13-50mm lump coal, after screening, is sent into crushed coal pressurized-gasification furnace by raw coal, and the classified grinding slurrying of fine coal is used for water coal slurry pressure gasification.
6. as described in any one of claim 1-5, produce the method for Sweet natural gas, it is characterized in that, the Lowlevel thermal energy steam preheating coal water slurry that described method utilizes crushed coal pressure gasifying technique to produce;
Preferably, described method also comprises the reaction heat being recovered in gasification in Sweet natural gas preparation process, conversion and methanation device and releasing, and comes preheat boiler-feed-water, de-salted water and/or condensed water respectively by heat exchange byproduct steam and low this reaction heat of potential energy UTILIZATION OF VESIDUAL HEAT IN.
7. as described in any one of claim 1-6, produce the method for Sweet natural gas, it is characterized in that, the steam of described water coal slurry pressure gasification institute by-product is used for phenol ammonia recovery unit.
8. as described in any one of claim 1-7, produce the method for Sweet natural gas, it is characterized in that, described broken coal vapourizing furnace production run oxygen load 4000-9000NM
3/ h, raw gas temperature out 225-600 DEG C, working pressure 3.0-6.0MPa, steam oxygen ratio is 5.0-8.0Kg/NM
3; And/or
Described coal slurry gasifier oxygen load 10000-15000NM
3/ h, oxygen coal is than 0.7-1.2kg/kg dry coal, and it is more than 4000Kcal/kg that as-fired coal calorific value requires, working pressure 3.0-8.0MPa.
9. as described in any one of claim 1-8, produce the method for Sweet natural gas, it is characterized in that, after described crushed coal pressure gasifying and coal water slurry gasification two portions operating process two kinds of raw gas mixing, the conversion bed temperature of carbon monoxide controls at 220-430 DEG C, the span of control 2.9-3.1 of methanation reaction hydrogen-carbon ratio.
10. for the device of combination producing natural gas method according to any one of claim 1-9, it is characterized in that, described device comprises crushed coal pressurized-gasification furnace and wet entrained flow bed gasification furnace, wherein:
Described crushed coal pressurized-gasification furnace adopts liquid or dry ash extraction mode, direct depended on pressure conveying or power conveying, and the waste water of discharging needs gas liquor separation, phenol ammonia recovery unit or biochemical treatment, and discharged producer gas temperature is about 225-600 DEG C;
Described wet entrained flow bed gasification furnace is that pure oxygen cooks vaporized chemical with coal slurry charging, slag tap, and gasification flame kernel temperature is between 1400-2200 DEG C, and discharged producer gas temperature is about 1400-1700 DEG C.
11. Sweet natural gases that method is produced according to any one of claim 1-9.
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