CN109652139A

CN109652139A - A kind of method and system preparing synthesis gas using volatile matter in low-order coal and waste water

Info

Publication number: CN109652139A
Application number: CN201811527433.7A
Authority: CN
Inventors: 马倩; 李荣辉; 吕彬峰; 陈锋江; 冯振涵
Original assignee: Zhejiang Tianlu Environmental Technology Co Ltd
Current assignee: Zhejiang Tianlu Environmental Technology Co Ltd
Priority date: 2018-12-13
Filing date: 2018-12-13
Publication date: 2019-04-19

Abstract

The present invention provides a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water, low-order coal drying process dried after low-order coal and exhaust gas, exhaust gas obtain coal dust through the first dust collecting process；Low-order coal after drying is handled to obtain gas mixture by the reducing process that gasifies；Gas mixture is handled to obtain mixed gas and waste water by purification process；Mixed gas is obtained through reforming process comprising CO and H₂The first synthesis gas；Water-coal-slurry is obtained after waste water, coal dust are mixed with slurries additive agent, by water-coal-slurry and O₂It handles to obtain comprising CO and H by coal-water slurry gasification₂The second synthesis gas；First synthesis gas and the second synthesis gas are mixed up to the synthesis gas.In the present invention, the volatile matter being not only utilized in low-order coal prepares synthesis gas, but also effectively recycles moisture and coal dust in low-order coal and pass through water-coal-slurry preparing synthetic gas again for making water-coal-slurry, and useless water reuse solves the problems, such as discharge of wastewater difficulty.

Description

A kind of method and system preparing synthesis gas using volatile matter in low-order coal and waste water

Technical field

The present invention relates to volatile matter and waste water in coal substance clean utilization technical field more particularly to a kind of utilization low-order coal Prepare the method and system of synthesis gas.

Background technique

More than half is low-order coal in the explored coal reserves in China, wherein the volatile matter contained is equivalent to 100,000,000,000 The petroleum resources of ton.Low-order coal mainly has the substance characteristics of high-moisture, high volatile, and in burning, flame is longer and has cigarette, Degree of coalification is lower, and typical coal is lignite and jet coal.The few oily deficency of China's richness coal, becomes how to efficiently use low-order coal and works as The key subjects of modern clean coal technology.However either combustion power generation or Modern Coal-based Chemical utilize, all because of its Gao Shui, height The efficiency that three big characteristics of ash and low heat value comprehensively utilize it is extremely low.

Modern Coal-based Chemical technology turns to technology faucet, level-one raw material CO needed for obtaining chemical industry synthesis by gasification with coal gas And H₂, but Coal Gasification Technology is developed so far, and not yet forms mature large-scale commercial low order Coal Gasification Technology.In the prior art By low-order coal vaporizing system for CO and H₂, low-order coal such as is usually dried at the pretreatment, then by the low order pyrolysis of coal after drying After obtain crude coal gas and upgraded coal.

Drying is that low-order coal is former as boiler oil, gasified raw material, direct liquefaction raw material, pyrolysis feed or other deep processings The first step of material.Drying is both the needs for meeting downstream processing requirement, and reduces entire project energy consumption and downstream unit The needs of investment.What is generated in drying process is directly discharged into atmosphere comprising exhaust gas such as a large amount of vapor and coal dust etc., can aggravate Environmental pollution, therefore the coal dust of the generation effectively in recycling drying process and moisture have important practical significance.In low-order coal Moisture be generally divided into Free water and combine water, and it is dry be typically only capable to remove most Free water in low-order coal, be very difficult to Except the combination water in low-order coal, most of Free water that usual drying process drying is removed is easy the recycling that is condensed, But it is difficult to recycle after low order pyrolysis of coal in conjunction with water.

The pyrolysis of low-order coal after general drying is carried out under conditions of having a large amount of oxygen (or air), one when pyrolysis Part coal will be reacted in oxygen produces a large amount of CO₂.Due to CO₂It cannot burn, belong to invalid gas, and because aerobic combustion It burns, nitrogen content is excessively high in crude coal gas, reduces the energy density of crude coal gas, reduces crude calorific value of gas, in addition to melting down Burning is outer, and the pyrolysis crude coal gas difficulty of output has other economic values, and the utilization rate of coal feedstock is low.In addition, the low order after dry Fail to enter in crude coal gas as water vapor, this part water contains by the combination water etc. of dry removal when pyrolysis of coal Amount also should not be underestimated.However, it is contemplated that water content is higher in low-order coal, and often non-in the rich regional water for producing low-order coal Chang Zhengui；If the coal dust in water resource and drying course valuable in ground low-order coal, waste utilization preparation can be recycled effectively simultaneously Water-coal-slurry, then by cool water mixture burning vaporizing system for synthesis gas, insufficient and pollution environment is recycled to existing low order moisture in coal is solved Have great importance.

Summary of the invention

In view of this, utilizing volatile matter in low-order coal in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of The method and system of synthesis gas is prepared with waste water, the volatile matter being not only utilized in low-order coal prepares synthesis gas, but also effectively For making water-coal-slurry by water-coal-slurry preparing synthetic gas, waste utilization economizes on resources moisture and coal dust in recycling low-order coal, Solve the problems, such as that existing low order moisture in coal recycling is insufficient and pollutes environment.

In order to solve the above technical problems, the present invention provides the following technical scheme that

A method of synthesis gas being prepared using volatile matter in low-order coal and waste water, is comprised the following steps that:

(1), low-order coal and exhaust gas after low-order coal drying process is dried, the exhaust gas pass through the first dedusting Process obtains coal dust；

(2), the low-order coal after drying described in step (1) is handled to obtain gas mixture by the reducing process that gasifies, The gasification reducing process is the chemical reaction process heated under anaerobic or micro-oxygen conditions to the low-order coal after drying；

(3), it handles gas mixture described in step (2) to obtain mixed gas and waste water by purification process；

(4), mixed gas described in step (3) is obtained through the reforming process of some hydrocarbon comprising CO and H₂'s First synthesis gas；

(5), water coal is obtained after mixing coal dust described in waste water described in step (3), step (1) with slurries additive agent Slurry, by the water-coal-slurry and O₂It handles to obtain comprising CO and H by coal-water slurry gasification₂The second synthesis gas；

(6), the second synthesis gas described in the first synthesis gas described in step (4) and step (5) is mixed to get the conjunction At gas.

Preferably using the low-order coal of powdery as raw material in the present invention, convenient for improving the efficiency of drying, drying generally can only Most Free water in low-order coal is removed, and the combination water in low-order coal cannot be removed, therefore, low-order coal passes through stoving process Low-order coal and exhaust gas after being dried after processing, the low-order coal after gained drying still contain a certain amount of moisture, this part Remaining moisture can gasify in subsequent gasification reducing process and become vapor.Some is understood simultaneously during drying The low-order coal of small grain size is entered in exhaust gas in the form of fugitive dust, this part fugitive dust is coal dust, and the granularity of raw material low-order coal is smaller, Coal dust in exhaust gas is more, and exhaust gas direct emission not only polluted environment, wastes coal resource, therefore pass through the first dedusting work The coal dust in exhaust gas after skill capture recycling stoving process has important economic value；Through the first dust collecting process exhaust gas recycling In 95% or more coal dust；Low-order coal after drying enters gasification reducing process and reacts to obtain the gas mixture of high temperature； The anaerobic that reducing process uses of gasifying or micro- oxygen environment be mainly in the following several ways: (1) gap, inside raw material low-order coal, The air of gap entrainment between material and material；(2) mixed few from leakages such as feed inlet, the discharge ports of gasification reducing process Measure air；(3), in explosion limit value hereinafter, can slightly be passed through the O for accounting for Coal Quality percentage 5% in gasification reducing process₂ Or (air), further preferably it is passed through the O for accounting for Coal Quality percentage 3%₂Or (air), be conducive to improve gasification reduction Temperature, slagging prevention of reaction etc., and ensure that the security and stability of entire gasification reducing process reaction simultaneously；It is preferred that drying Low-order coal afterwards carries out gasification reduction reaction in oxygen-free environment, and the low-order coal after avoiding drying is anti-into gasification reducing process Combustion reaction occurs with oxygen during answering, generates a large amount of aphlogistic CO₂, to guarantee the air-fuel mixture of obtained high temperature CO in object₂Deng volume basis it is smaller, be conducive to the subsequent synthesis gas for preparing high-energy density, and processing step is few, simply It is easy to operate, so that reaction can carry out safely.Remaining moisture enters height as water vapor in low-order coal after drying The gas mixture of temperature contains CO, H in gas mixture₂、CO₂, hydro carbons, dust, vapor, coal tar and sulfur-containing compound Deng by purification process except foreign gases such as dust, coal tar, vapor and sulfur-containing compounds, thus after being purified Mixed gas, the vapor in recycling high-temperature oil gas obtain waste water；Mixed gas mainly includes CO, H₂And hydro carbons, many institute's weeks Know, CO and H₂It can then need reforming could generate CO and H directly as the level-one raw material of chemical industry synthesis, hydro carbons₂, therefore benefit Part hydrocarbon reformation in mixed gas is converted to obtain comprising CO and H with reforming technique₂The first synthesis gas, first synthesis CO and H in gas₂A part derives from mixed gas original CO and H₂, another part obtains from some hydrocarbon is reforming Include CO and H₂, substantially increase CO and H in the first synthesis gas₂Total percent by volume, calorific value increase.By above-mentioned waste water, water coal Slurry additive and coal dust are mixed and made into flowable solution, and water-coal-slurry can be obtained；Finally again by water-coal-slurry and O₂Pass through together Coal-water slurry gasification is obtained comprising CO and H₂The second synthesis gas, in coal-water slurry gasification mainly will be in water-coal-slurry Coal substance and O₂Burnup heat release, coal substance is reacted with the water in water-coal-slurry generates CO and H₂, thus the second synthesis gas of preparation.Finally, First synthesis gas and the second synthesis gas are mixed, the target product synthesis gas that can be obtained, the energy density of synthesis gas is big, calorific value Height takes full advantage of the efficient resource in low-order coal.

Preferably, purification process described in step (3) includes the second dust collecting process, oil gas cooling technique and sulfur removal technology. Contain a large amount of dust, coal tar, vapor, sulfur-containing compound etc. in the gas mixture of high temperature；First with the second dedusting work Skill dedusting prevents the temperature of the gas mixture in dust removal process from reducing, and coal tar and vapor etc. are condensed into liquid and adhere to A large amount of dusts cause subsequent technique line clogging, and dust removing effects is caused to decline；Oil gas cooling technique is recycled to remove a large amount of coal The problems such as tar and vapor obtain oil water mixture, prevent cooling be attached in process pipe of coal tar from blocking pipeline, carbon distribution, Oil water mixture is handled using water-oil separating, and waste water can be obtained；Finally by oil gas cooling technique, that treated is remaining again Gas removes sulfur-containing compound by sulfur removal technology, prevents sulfur-containing compound from causing the catalyst poisoning in subsequent technique, uses Process above can remove foreign gas and solid, and so as to the mixed gas after being purified, mixed gas impurity is few, convenient for subsequent Process ensure that the stability of follow-up equipment

Preferably, the reaction temperature of gasification reducing process described in step (2) is 350-800 DEG C.At this temperature, it dries The volatile matter in low-order coal afterwards is escaped from low-order coal, to obtain the gas mixture of high temperature, is remained after the reduction reaction that gasifies Remaining solid residue is the upgraded coal with temperature, and the volatile matter content in upgraded coal is 8-15wt%.Wherein, gasify reducing process It can be level-one, or multistage.When using level-one gasification reducing process, primarily to obtaining the oil of most of high temperature Gas mixture, the height of temperature directly affect the temperature of subsequent gas production, the yield of upgraded coal and level-one upgraded coal；When using more When grade gasification reducing process, multistage gasification reducing process main function is can not gasify in upper level gasification reducing process Solid matter (including gasification after fine coal, solid impurity etc.), it is a certain amount of can not gasify within certain residence time it is similar The higher boilings grease such as pitch continue gasification and the residence time it is short have little time be precipitated or temperature phenolic compound, fragrance is not achieved The polycondensation reaction condition of hydrocarbon compound etc., gasification that the reaction was continued are conducive to the quality for improving gas yield and upgraded coal.

Reforming mainly includes Partial Oxidation, the conversion of vapor catalyzed reforming and on-catalytic reforming.It urges part Change oxidation, it is vapor catalyzed it is reforming be required to catalyst, the catalyst of reforming technique is mostly loaded catalyst, activity Component is mainly that Ni, Co, Fe, Cu etc. be nonmetallic and the noble metals such as Rh, Ru, Pt.It is reforming to generally require heat supply, it can use The mode of direct heating or indirect heating.CO and H in first synthesis gas₂Source be two parts, a part be gaseous mixture The CO and H that some hydrocarbon is obtained by catalyzed conversion in body₂, another part is original H in mixed gas₂And CO.

Partial Oxidation under the effect of the catalyst, is mixed using oxygen and a part of hydrocarbon fuel direct heating It closes some hydrocarbon in gas and reacts generation CO and H with vapor₂；Using extraneous heat supply when vapor catalyzed reforming, urging It reacts some hydrocarbon and vapor in gaseous mixture and generates CO and H₂；The key reaction machine of two methods Reason are as follows:

(1)CmHn+mH₂O=mCO+1/2 (n+2m) H₂Main reaction, the endothermic reaction

(2)CO+H₂O=CO₂+H₂Side reaction, the endothermic reaction

On-catalytic reforming conversion, which is reformed, does not need catalyst, key reaction mechanism are as follows: CH₄+1/2O₂→CO+2H₂, remove methane Other outer hydro carbons and methane and O₂Reaction mechanism it is similar.

It is preferred, therefore, that reforming technique described in step (4) is Partial Oxidation, the Partial Oxidation For pure oxygen and vapor are passed through in mixed gas, under the conditions of existing for 850-1300 DEG C of the temperature and catalyst, gaseous mixture Some hydrocarbon in body is reacted with vapor, obtains CO and H₂。

Preferably, reforming technique described in step (4) is vapor catalyzed reforming, and vapor catalyzed reform turns It turns to and vapor is passed through in mixed gas, so that temperature is reached condition existing for 850-1200 DEG C and catalyst in indirect heating Under, some hydrocarbon reacts to obtain CO and H with vapor in mixed gas₂。

Preferably, reforming technique described in step (4) is on-catalytic reforming conversion, and the on-catalytic reforming is converted into Pure oxygen is passed through in mixed gas, some hydrocarbon in mixed gas reacts to obtain CO and H with pure oxygen₂。

Preferably, the granularity of coal dust described in step (1) is less than 1mm.Water-coal-slurry preparation first has to carry out coal substance thin Mill, the coal dust in exhaust gas generated during stoving process due to raw material of the present invention, can through the first dust collecting process In exhaust gas 95% or more coal dust is recycled, coal powder size is generally less than 3mm, and coal dust of the preferred size less than 1mm is as subsequent system The raw material for making water-coal-slurry, by coal dust, with waste water, additive mixing can be obtained water-coal-slurry without milled processed, save technique Step, and the cost of coal pulverizer is greatly reduced, improve the service life of coal pulverizer.Still further preferably, fine coal partial size ≤ 50 μm of coal dust.

Preferably, water-coal-slurry and O described in step (5)₂Before being handled by coal-water slurry gasification, the water-coal-slurry is first By filter pulp process, then with O₂It is obtained by coal-water slurry gasification comprising CO and H₂Synthesis gas.Considering slurry purpose is to remove The coarse granule occurred during water-coal-slurry processed and the certain sundries for being mixed into slurry, to prevent water coal slurry in storage and transportation and combustion process Middle blocking pipeline and nozzle etc..

Preferably, it is additionally provided with gasification feeding process between the stoving process and gasification reducing process, after the drying Low-order coal enters back into the gasification reducing process after gasification feeding process processing is separated into single-size, using such Technique can increase the low-order coal heating surface area after drying, be conducive to accelerate gasification reduction reaction, obtain a large amount of air-fuel mixture Object etc..

Any one of above-mentioned system using the method, including drying unit, gasification reduction apparatus, the first dedusting dress Set, the second dust-extraction unit, oil gas cooling device, desulfurizer, reforming reactor, water-coal-slurry mixing arrangement, gasification furnace and Synthesis gas storage tank, the drying unit are connect by the feeding device that gasifies with the gasification reduction apparatus, the drying unit Discharge port connect with first dust-extraction unit, it is described gasification feeding device upper end connect with second dust-extraction unit, Second dust-extraction unit is sequentially connected with the oil gas cooling device, desulfurizer, and the desulfurizer and described reform turn Change reactor connection, the oil gas cooling device, the first dust-extraction unit are connect with the water-coal-slurry mixing arrangement, the water coal Slurry mixing arrangement is connect with the gasification furnace, and the reforming reactor, gasification furnace are connect with the synthesis gas storage tank.

Low-order coal, which enters in drying unit, dries, low-order coal and exhaust gas after being dried, includes a large amount of coal in exhaust gas Powder and vapor, exhaust gas handle to obtain coal dust from the discharge port of drying unit through the first dust-extraction unit；Low-order coal warp after drying It is delivered in gasification reduction apparatus after gasification feeding device dispersion city single-size and carries out gasification reduction reaction, wrapped after reaction Gas mixture and upgraded coal containing a large amount of vapor, the vapor in gas mixture enter from the upper end of gasification feeding device Obtain the oil water mixture of liquid after entering back into the condensation of oil gas cooling device in second dust-extraction unit after dedusting, oil water mixture into Enter the waste water at oil water separator；Remaining gas, which enters in desulfurizer, after the processing of oil gas cooling device removes sulfide and obtains Mixed gas.Mixed gas is passed through in reforming reactor again and is obtained comprising CO and H₂The first synthesis gas.By waste water, water Slurry additive and coal dust obtain water-coal-slurry after mixing in water-coal-slurry mixing arrangement；By water-coal-slurry and O₂It is passed through gasification furnace together Middle reaction can be obtained after reaction comprising CO and H₂The second synthesis gas, the first synthesis gas and the second synthesis gas are deposited in synthesis gas Synthesis gas can be obtained in storage tank mixing, and synthesis gas is as stored energy source.

Based on above technical scheme, the volatile matter preparation in low-order coal is not only effectively utilized in method in the present invention Synthesis gas, and effectively recycle moisture and coal dust in low-order coal and pass through water-coal-slurry preparing synthetic gas again for making water-coal-slurry, Wastewater through organic matter content is high, there is certain calorific value, and complicated component causes cost for wastewater treatment high, and useless water reuse solves The problem of discharged wastewater met the national standard difficulty, takes full advantage of the advantage that organic compound combustion calorific value is high in waste water, while solving coal dust The low problem of utilization rate.And the system equipment in the present invention is simple, and easy to operate, mostly existing equipment, operating cost are lower.

Detailed description of the invention

It, below will be in embodiment in order to illustrate more clearly of embodiment in the present invention or technical solution in the prior art Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only one recorded in the present invention A little embodiments are also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.

Fig. 1 is a kind of process signal for the method that synthesis gas is prepared using volatile matter in low-order coal and waste water in the present invention Figure；

Fig. 2 is a kind of system construction drawing that synthesis gas is prepared using volatile matter in low-order coal and waste water in the present invention；

Fig. 3 is the structural schematic diagram of gasification feeding device in the embodiment of the present invention；

Fig. 4 is the structural schematic diagram of gasification reduction apparatus in the embodiment of the present invention；

Fig. 5 is the main view partial sectional view of gasification reduction apparatus in the embodiment of the present invention.

Appended drawing reference: 1, horizontal reacting kettle, 2, feed inlet, 3, discharge port, 4, driving mechanism, 41, ring gear, 42, support roller, 43, motor, 44, transmission gear, the 5, first heating mechanism, 51, heater, 52, heater box, 53, heating pipe, 54, heat out Port, the 6, second heating mechanism, 7, deflector, 9, dynamic and static sealing device, 10, gasification reduction apparatus, 11, gasification feeding device, 111, helical blade, 112, gasification motor, 100, drying unit, the 200, first dust-extraction unit, the 300, second dust-extraction unit, 400, Oil gas cooling device, 500, water-coal-slurry mixing arrangement, 600, gasification furnace, 700, synthesis gas storage tank, 800, desulfurizer, 900, Reforming reactor.

Specific embodiment

Next combined with specific embodiments below invention is further explained, but does not limit the invention to these tools Body embodiment.One skilled in the art would recognize that present invention encompasses may include in Claims scope All alternatives, improvement project and equivalent scheme.

In the present invention, if not refering in particular to, used raw material and equipment etc. are commercially available or commonly used in the art. Method in following embodiments is unless otherwise instructed the conventional method of this field.

In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "inner", "outside" is base In orientation or positional relationship shown in the drawings or the invention product using when the orientation or positional relationship usually put, only It is that for the convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have specifically Orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " the Two " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.

In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ", " installation ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect It connects；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition Concrete meaning in the present invention.

As shown in Figs. 1-5, the invention discloses a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water, It comprises the following steps that:

Raw material low-order coal of the invention can be fine coal and be also possible to lump coal, when low-order coal uses lump coal, to bulk excessively Coal can be by broken, screening process to obtain the lesser fine coal of granularity.It is preferred that using fine coal as raw material, be on the one hand because of Fine coal is no longer needed to through broken, screening process, saves processing step, and heating surface area is big when drying, and drying efficiency is high, is on the other hand Fine coal is cheap with respect to lump coal, it is preferred to use granularity is less than the fine coal of 20mm, still further preferably using granularity less than 6mm's Fine coal.

Volatile matter content is generally 20%-55% in low-order coal, and the content of tar is 3%-15% or so, and fixed carbon contains Amount is 30%-60%, the content of water is 10%-40%, remaining as dust and other impurities.The degree of coalification of low-order coal is low, but Contain petroleum resources abundant, the volatile matter being rich in low-order coal is highly beneficial to synthesis gas is extracted, therefore preferably volatile matter exists Low-order coal between 30%-55%.

Drying can only generally remove most Free water in low-order coal, and cannot remove the combination water in low-order coal, because This, low-order coal by stoving process handle after dry after low-order coal and exhaust gas, gained dry after low-order coal still contain There is a certain amount of moisture, the moisture of this some residual can gasify in subsequent gasification reducing process becomes vapor.If low order Contain a large amount of moisture in coal, heat consumption is big during will lead to gasification reduction reaction, and therefore, technical solution of the present invention is preferred The portion of water first removed in low-order coal is handled by stoving process to low-order coal.The drying medium of stoving process can be Flue gas or vapor, drying can be divided into directly drying and indirect drying.When using flue gas as medium is dried, although flue gas The efficiency of the drying directly contacted with low-order coal is highest, but while being dried using flue gas wants strict control stoving process For the percent by volume of oxygen in explosion limit hereinafter, to prevent detonation, the efficiency of flue gas indirect drying is also unsatisfactory in environment, Therefore for production safety and drying efficiency, preferably vapor is dried.Vapor directly dries and is easy to be likely to result in vapor It is mixed into and is provided with the consumption in low-order coal, not only causing reaction coal resource, have and reduce drying efficiency, therefore use vapor The drying mode of indirect drying low-order coal, to prevent the moisture in water steam from entering in low-order coal.In addition, in drying course if Water vapour pressure is excessive, and vapor bring temperature is excessively high to be easy to cause during the drying process, volatile matter meeting in part in low-order coal It escapes, the evolution of one side volatile matter can bring security risk, on the other hand will affect the production of subsequent gasification reducing process Tolerance, therefore dry steam pressure in drying course and be not easy excessive, to guarantee not only to can guarantee drying effect, but also it can guarantee low order Volatile matter in coal is not gasified.It is preferred, therefore, that stoving process uses water vapour indirect drying, the pressure of water vapour is 0.3-1.5Mpa, the temperature of water vapour are 105-250 DEG C, can maximumlly be reduced containing in low-order coal under this process condition Water rate, it might even be possible to so that being reduced to 7wt% hereinafter, at this time from the water content in the low-order coal that the discharge port of stoving process is discharged Most moisture is escaped from low-order coal along with fugitive dusts such as coal dusts, and generated as water vapor into after drying In exhaust gas, the outlet mass temperatures of stoving process are 50-150 DEG C；Still further preferably, when the pressure of vapor is 0.6- 1.2Mpa, when the temperature of vapor is 120-200 DEG C, the moisture content of low-order coal will decrease to 6wt% hereinafter, drying work after drying The outlet mass temperatures of skill are 80 DEG C -130 DEG C.

Stoving process of the invention can be level-one, or it is multistage, because if low-order coal after level-one stoving process Moisture content still reach to the requirement less than technique, can be continued using multistage dry such as second level drying, three-level stoving process into one Drying is walked, until the moisture content of low-order coal meets process conditions after drying.In addition, multistage stoving process can be arranged in series It can also be arranged in parallel, drying effect can be reinforced when connecting using multistage stoving process, stoving process can be increased when in parallel Treating capacity therefore according to the demand of actual production technique be series connection to multistage stoving process or in parallel in parallel or in series Design simultaneously, can be adjusted according to the actual situation, as long as identical technical effect can be reached, specifically, for example, When the inlet amount of stoving process is in terms of the low-order coal of 20-30t/h, level-one steam drying technique can be used；When stoving process into Second steam stoving process can be used in terms of the low order of 50-70t/h in doses, more economical reasonable in this way.

Exhaust gas in drying course mainly includes the low-order coal of small grain size and the vapor that drying is removed, raw material low-order coal Granularity is smaller, and the coal dust in exhaust gas is more, and exhaust gas direct emission not only polluted environment, wastes coal resource, therefore pass through The coal dust in exhaust gas after first dust collecting process recycling stoving process has important economic value.It can be returned through the first dust collecting process In exhaust gas 95% or more coal dust, referred to herein as coal dust are received, coal powder size is generally less than 3mm, and preferred size is less than the coal dust of 1mm Raw material as subsequent production water-coal-slurry improves grinder to reduce the grinding technics to large particulate matter in water-coal-slurry Service life and efficiency.Preferably, exhaust gas remaining gas after the processing of the first dust collecting process handles to obtain through condensation process again Second waste water, the second waste water of this part can also be used as the raw material of the water resource of subsequent preparation water-coal-slurry, low to make full use of All moisture in rank coal.

Low-order coal after being dried by stoving process enters gasification reducing process and is reacted, low-order coal after the drying into Gasification feeding process can also be added before entering the reducing process that gasifies, it is also original-pack so that the low-order coal after drying is rapidly entered gasification It sets, increases the surface area of material, be conducive to accelerate gasification reduction reaction.

Wherein, gasification reducing process is that the chemistry that is heated under anaerobic or micro-oxygen conditions to the low-order coal after drying is anti- Answer technique.Low-order coal after drying is delivered to gasification reducing process, under the heating of the heat mediums such as flue gas, nothing in reaction process Other substances such as additive need to be added, temperature is generally 350 DEG C -800 DEG C, complex chemical reaction occurs under pressure≤30Kpa Process obtains the gas mixture of solid carbon and high temperature, and solid carbon is the upgraded coal for having certain temperature, upgraded coal Temperature is 350 DEG C -800 DEG C.The gas mixture of high temperature is to include CO, H₂、CO₂, hydro carbons, coal tar, dust and sulfur-containing compound Deng more foreign gases.

Wherein, the source of oxygen is mainly in the following several ways in the anaerobic or micro- oxygen environment that gasification reducing process uses: (1), the gap inside raw material low-order coal, the air of the gap entrainment between material and material, the O in the air of this part₂? It is reacted immediately with coal in the environment of gasification reducing process high temperature and generates CO₂Or CO；(2) from gasification reducing process feed inlet, Discharge port etc. reveals mixed a small amount of air, the oxygen of this partial air, the micro O in this part₂It is high in gasification reducing process It is reacted immediately with coal under the environment of temperature and generates CO₂Or CO；(3), in explosion limit value hereinafter, can be slightly in gasification reducing process It is passed through the O for accounting for Coal Quality percentage 5%₂Or (air), 1. this operation, which has the advantage that, can be improved gasification reduction work Temperature and capacity usage ratio in skill；2. improving the conversion ratio of charcoal；3. preventing coal coking；4. a small amount of O₂It is incomplete with low-order coal Burning produces more CO, brings more synthesis gas to be subsequent.Since gasification reducing process internal temperature is higher, it is passed through A small amount of O₂Moment can occur oxidation reaction (including combustion reaction), and the burning point of many combustibles is all in the anti-of gasification reduction reaction Answer temperature or less.12%~74.2% is limited to because CO mixes with air explosion；H₂Explosion value is 4%-75%.O₂Account for AIR Proportional It is 21%.The explosion limit upper value of pure oxygen is 6% or so after conversion.By theoretical calculation, the coal of 100kg can generate about 80Nm³ CO and H₂.So being passed through the O for accounting for Coal Quality percentage 5%₂It is safe；Still further preferably, it is passed through and accounts for Coal Quality The O of percentage 3%₂, with the security and stability for the reducing process reaction that ensures entirely to gasify.But when the temperature of gasification reduction reaction When degree meets technique and requires, it can not also be passed through oxygen, it is anti-that the low-order coal after preferably drying in oxygen-free environment carries out gasification reduction It answers, so that reaction can carry out safely.

Wherein, gasification reducing process can be level-one, or multistage.It is main when using level-one gasification reducing process If the gas mixture of most of high temperature, the height of temperature directly affect subsequent gas production, the yield of upgraded coal in order to obtain With the temperature of level-one upgraded coal, the reaction temperature for the reducing process that gasifies is 350 DEG C -800 DEG C, and the volatile matter content in upgraded coal is 8-15wt%, further preferably, the reaction temperature for the reducing process that gasifies are 400-750 DEG C；Still further preferably 450-700 DEG C. When using multistage gasification reducing process, multistage gasification reducing process main function is the nothing in upper level gasification reducing process Method gasification solid matter (including gasification after fine coal, solid impurity etc.), it is a certain amount of can not within certain residence time gas The higher boilings grease such as similar pitch changed continues gasification and the residence time short has little time precipitation or phenol generalization is not achieved in temperature The polycondensation reaction condition of object, arene compound etc. is closed, gasification that the reaction was continued is conducive to the product for improving gas yield and upgraded coal Matter.

Other than the temperature of guarantee gasification reducing process is reasonable, while it must also guarantee certain in gasification reducing process stop The time is stayed, the residence time is too short, and volatile matter also not evolution gasification completely while influencing gas yield, more influences upgrading The quality of coal；Residence time is too long, although product is guaranteed, yield is not caught up with, so keeping a reasonable gasification The reduction reaction residence time is most important to product yield and quality.It is general to gasify since the kind of raw material low-order coal is different The residence time of material is 30min-4h in reducing process.

Preferably using two-stage gasification reducing process in the present invention, the material after stoving process drying is introduced into level-one gasification also Original process enter back into second level gasification reducing process, and the low-order coal after drying is introduced into level-one gasification reducing process and obtains level-one gas With level-one solid, level-one solid enter back into second level gasification reducing process continue gasification obtain secondary gas and second level solid, second level Solid is upgraded coal；The feeding temperature of level-one gasification reducing process is 80 DEG C -120 DEG C, and air outlet temperature is 180 DEG C -550 DEG C, Reaction temperature is 450 DEG C -650 DEG C, and drop temperature is 350 DEG C -600 DEG C；The feeding temperature of second level gasification reducing process is 350 DEG C -600 DEG C, drop temperature is 450 DEG C -750 DEG C, and reaction temperature is 550 DEG C -800 DEG C, and air outlet temperature is 450 DEG C -700 ℃.When using two-stage gasification reducing process, primarily to most of volatile is made to be gasified totally, it can obtain a large amount of Gas can obtain the lower upgraded coal of volatile matter again, and wherein the volatile matter content in upgraded coal is 3-8wt%.

In addition, from the upgraded coal with certain temperature that gasification reducing process is handled, during the reducing process that gasifies The upgraded coal granule size of generation is different, and especially the lesser upgraded coal of granularity, moisture-free are easy to produce fugitive dust, it has not been convenient to Transport be easy to cause environmental pollution, therefore upgraded coal is sieved to the coal dust for obtaining granularity and being less than 1mm, as preparation water-coal-slurry The upgraded coal of the supplement of coal resource, granularity less times greater than 1mm directly can sell or do stored energy source.

The gas mixture of high temperature obtained from gasification reducing process enter purification process with remove solid dirt, tar, Mixed gas and waste water etc. can be obtained after vapor and sulfur-containing compound etc..

Purification process includes the second dust collecting process, oil gas cooling technique and sulfur removal technology, and gas mixture is successively through second Dust collecting process, oil gas cooling technique and sulfur removal technology handle to obtain comprising CO, H₂With the mixed gas of hydro carbons and waste water etc..High temperature Gas mixture in containing a large amount of dust, coal tar, vapor, sulfur-containing compound etc.；It is removed first with the second dust collecting process Fall the dust of gas mixture, because of the dust in high-temperature oil gas, most of is all that fine dust is either practically free of and waves The solid particle etc. of hair point, contains more high-ash solid coal dust.This fraction solids coal dust, which enters in oil water mixture, to be generated greatly The greasy filth of amount, because of oil-in-water, the interaction of Water-In-Oil, solid coal dust should contain a large amount of specific surface area, play well Action of Surfactant so that the oil water mixture that subsequent oil gas cooling technique condenses becomes abnormal sticky, cause oil, Water, dust are difficult to separate；Also for preventing tar condensing adhering dust in dust removal process from process pipe being caused to block, it is therefore desirable to Second dust collecting process is to remove a large amount of dust in high-temperature oil gas.The coal dust that second dust collecting process is removed can largely return To gasification reducing process, the reaction was continued, and the dust generated when maintenance when appliance arrangement chamber clean can be used as preparing the original of water-coal-slurry Material.Gas mixture after the second dust collecting process dedusting by recycling oil gas cooling technique to remove a large amount of tar and vapor Deng, prevent cooling be attached in process pipe of tar from blocking pipeline, the problems such as carbon distribution, oil water mixture using water-oil separating at Reason, can be obtained waste water and greasy filth.Greasy filth is mainly the substances such as solid ash, coal and oil, and oil-sludge treatment discharge is difficult, and is easy The waste of resource in greasy filth is caused, therefore can be the source for doing the coal substance of preparation water-coal-slurry by greasy filth.It is last again that oil gas is cold But the residual gas after process removes sulfur-containing compound by sulfur removal technology, prevents sulfur-containing compound from causing in subsequent technique Catalyst poisoning, foreign gas and solid can be removed using process above, so as to the mixed gas after being purified, gaseous mixture Body impurity is few, handles convenient for subsequent technique, ensure that the stability of follow-up equipment.

In order to advanced optimize technique, electric tar technique can also be added after sulfur removal technology and is used to capture a small amount of tar, To be further reduced the amount of tar in gas；It, can also be if the volume fraction in gas mixture containing unsaturated hydrocarbons is excessively high The problems such as adding hydrogenation technique after sulfur removal technology and be translated into saturated hydrocarbons, preventing unsaturated hydrocarbons decarburization and cause carbon distribution；May be used also Denitrating technique or dechlorination process are added after sulfur removal technology to realize further purification.

Preferably gasified reducing process using two-stage in the present invention, every grade of gasification reducing process is distinguished successively with respective second Dust collecting process and oil gas cooling technique；Amount of dust after every grade of gasification reduction in the high-temperature oil gas that generates is larger, therefore, in order into One-step optimization technique, every grade of gasification reducing process are first connect with respective second dust collecting process, and every grade of the second dust collecting process is again It is sequentially connected with same set of oil gas cooling technique and sulfur removal technology, to save process procedure.

It obtains mixed gas from purification process and is handled into reforming technique to obtain comprising CO and H₂First Synthesis gas.It wherein, include CO, H in mixed gas₂、CO₂With include CH₄Hydro carbons etc..

Mixed gas may also pass through compression process and be further processed before entering reforming process, to improve mixing The pressure of gas is conducive to accelerate the rate of reforming reaction.

Mixed gas again through the reforming technique of some hydrocarbon be in mixed gas gas each component without isolation, directly Some hydrocarbon is reforming for CO and H₂Hydrocarbon conversion technique because reforming purpose is intended merely to the hydrocarbon conversion Generate CO and H₂, and itself contained some CO and H in mixed gas₂, there is no need to isolate hydro carbons from mixed gas The reforming of hydro carbons is carried out again, and processing step, high financial profit are saved using such operation.

Partial Oxidation is to reach reaction temperature using oxygen (pure oxygen) and a part of hydrocarbon fuel direct heating 850-1300 DEG C, under the effect of the catalyst, some hydrocarbon in mixed gas is reacted with vapor generates CO and H₂；Steam Using extraneous heat supply when catalytic reforming converts, so that temperature is reached 850-1200 DEG C, make mixed gas under the effect of the catalyst In some hydrocarbon reacted with vapor generate CO and H₂；The key reaction mechanism of two methods are as follows:

(1)CmHn+mH₂O=mCO+1/2 (n+2m) H₂Main reaction, the endothermic reaction

(2)CO+H₂O=CO₂+H₂Side reaction, the endothermic reaction

With CH₄For, key reaction equation CH₄+H₂O→CO+3H₂, the H of generation₂Molar ratio with CO is 3:1, than Example is larger, highly beneficial to the first synthesis gas of preparation.

On-catalytic reforming conversion, which is reformed, does not need catalyst, key reaction mechanism are as follows: CH₄+1/2O₂→CO+2H₂, by pure oxygen It is passed through in mixed gas, the H generated after reaction₂Molar ratio with CO is 2:1, is conducive to prepare the first synthesis gas.In addition to methane Other hydro carbons and methane and O₂Reaction mechanism it is similar.

Table 1: the value range of each volume components percentage in reforming preceding mixed gas:

Component	H₂	Include CH₄Hydro carbons	CO	CO₂	Other
						Content	15-45%	10-52%	5-25%	5-25%	0.1-10%

Other components are N₂, vapor etc., the summation of the percent by volume of each component is in reforming preceding mixed gas 100%.

Table 2: the value range of each volume components percentage in reforming rear mixed gas:

Component	H₂	Include CH₄Hydro carbons	CO	CO₂	Other
						Content	30-70%	1-5%	10-30%	3-35%	0.1-10%

Other components are N₂With vapor etc., it is reforming after in mixed gas the summation of the percent by volume of each component be 100%.

Due to not adding external substance substantially during gasification reducing process, according to mass conservation law, low-order coal is passed through Stoving process, gasification reducing process and purification process processing after gained mixed gas weight be low-order coal volatile matter 15~ 50%, thus the gas in the provable method low-order coal using in the present invention is substantially complete by gasification, the mixed gas of acquisition Yield it is high.By Tables 1 and 2 it is found that mixed gas is after reforming process, the volume ratio of the hydro carbons in mixed gas Percentage is reduced to 1-5% by original 10-52%, it is reforming after mixed gas in be the first synthesis gas, first closes At the H in gas₂It is greatly improved with the volume ratio percentage of CO.

Water-coal-slurry is a kind of environmental clean fuel of New type coal base flow body, burning of coal characteristic has both been remained, but also with class It is the real clean coal technology in one, current China like the liquid-phase combustion application characteristic of heavy oil.Water-coal-slurry by 65-70% coal, The water of 29-34% and chemical addition agent less than 1%, are made by certain processing technology, appearance picture oil, good fluidity, It stores general 3-6 months and does not precipitate, convenient transportation, high combustion efficiency, pollutant (SO₂、NO_X) discharge is low, about 2t water-coal-slurry can be with 1t fuel oil is substituted, can be used in the generation oil such as Industrial Boiler, station boiler and Industrial Stoves or coal, gas；Water-coal-slurry crosses water-coal-slurry gas Chemical industry skill prepares CO and H₂, it is the indispensable synthesis gas for preparing methanol etc..

3 water-coal-slurry of table, heavy oil, natural gas unit calorific value, price comparison sheet

Title	Calorific value (MJ/Kg)	Price (member/t)	Unit calorific value price (member)
				Water-coal-slurry	18-20	350	0.019-0.017
Heavy oil	40.98	1500-1800	0.037-0.044
				Natural gas	36.12(MJ/Nm³)	1.7 (members/Nm³)	0.054

As shown in Table 3, the unit calorific value price of water-coal-slurry is lower, therefore it is next to can be used as a kind of very economical calorific value Source.

From the point of view of the long term growth of water-coal-slurry industry, pulping raw material should be based on cheap jet coal, weakly caking coal, no The high-orders coals such as low-order coals and anthracite, meager coal, poor Of-thin coal such as glutinous coal, lignite, or such as municipal sludge, industrial sludge, coal slurry flotation Etc. various solid waste, the economy of water-coal-slurry not only can be improved, also comply with and national rationally utilize coal and waste resource Policy.

Slurries additive agent mainly includes viscosity reduction dispersing agent and stabilizer.Wherein dispersing agent is mostly important, it is directly affected The quality and preparation cost of water-coal-slurry.(1), dispersing agent: the surface of coal has strong hydrophobicity, cannot be intimately associated with water As a kind of slurry, a kind of wet walk only will form in higher concentration.A small amount of dispersing agent is added in slurrying and changes coal The surface nature of grain, making coal particle surface tightly is that additive molecule and hydration shell surround, and coal grain is allowed to be uniformly dispersed in water, and The mobility of water-coal-slurry is improved, dosage is about the 1% of coal.In general, dispersing agent is a kind of surfactant.Common surface Activating agent has sulfonate type segregant surfactant (such as lignosulfonates tea sulfonate, alkenyl sulfonate), polyoxy second Alkene punishment is non-from surfactant, water soluble polymer f polymer and anion surface active column and non-ionic surface active The compound of agent.(2), stabilizer: water-coal-slurry is one kind after all by solid, liquid two-phase coarse dispersion system, and coal grain is easy to spontaneous again Ground coalesces each other.Under gravity or other outer plus mass force effects, precipitating occurs and is inevitable.It is firmly heavy to prevent It forms sediment, it is necessary to a small amount of stabilizer be added.Stabilizer acts on of both having, and water-coal-slurry is on the one hand made to have the rheology of shear shinning Characteristic has higher viscosity when the static storage of water-coal-slurry, viscosity can lower rapidly again after starting flowing；On the other hand make Sediment has soft structure, prevents expendable hard precipitating.

Because the ash content that obtains in high-temperature oil gas of the low-order coal after drying after the reduction reaction that gasifies is most of all Be dust either be the complete solid particle etc. that gasifies, the content of the coal substance contained is seldom, this part dust enters generation A large amount of sludge in oil water mixture, so that the mixed object of grease becomes sticky and leads to isolated discharge reduction, it is therefore desirable to which second removes A large amount of dust in oil gas of the dirt technique to remove high temperature.The dust that second dust collecting process is removed, largely may return to Gasifying, the reaction was continued for reducing process, and the dust generated when maintenance when appliance arrangement chamber clean can be used as preparing the raw material of water-coal-slurry.

Since stoving process cannot completely remove the moisture in low-order coal, the freedom being generally in low-order coal that can be removed Water, alternatively referred to as free water, including free moisture and inherent moisture, in the majority with free moisture, the combination water in low-order coal can not It is removed by drying, therefore obtained in the gas mixture of high temperature from gasification reducing process containing a certain amount of vapor, water The measurer body of steam is related with the type of low-order coal and drying degree, is generally not more than the 15wt% of raw material low-order coal；High temperature Gas mixture, which first passes through, to be entered back into oil gas cooling technique after the second dust collecting process dedusting and obtains waste water, since the oil gas of high temperature is mixed Closing vapor in object, while cooling, gaseous coal tar also is cooled simultaneously, by water-oil separating processing by oil and Water separates to obtain waste water and coal tar and a small amount of greasy filth.In waste water, still contain a small amount of coal tar, mainly Exist in the form of oil-in-water, COD (COD) is even higher between 5000mg/L~100000mg/L；Waste water at Divide complexity, contains phenols, oil and ammonia nitrogen etc..Wherein, phenols mainly contains methyl class phenol, catechol, and benzenediol etc. is complicated Aromatic hydrocarbon substance.The salinity of waste water is very high, and various ion concentrations are high, and the content of especially high price example is more prominent, this will give The performance of water-coal-slurry brings significant impact.Phenols has certain acidity mostly, with the waste water slurrying of high salinity, it is difficult to reach Destruction of the high salinity to coal slurry mobility can be mitigated due to the presence of Phenol for Waste Water class to the requirement of high-concentration coal-water slurry, Therefore, the waste water energy containing phenols improves water-coal-slurry performance.

It is on the one hand that the middle impurity in waste water is more using waste water as the source of the water of production water-coal-slurry, processing discharge Difficulty is used as preparation water-coal-slurry, not only solves the problems, such as sewage discharge difficulty, and be effectively utilized water resource, especially The original shortage of water resources in the Northwest；It is to contain a small amount of coal tar in waste water on the other hand compared with pure industrial water The substances such as oil, phenols, lime-ash, the presence of the substances such as phenols are conducive to water-coal-slurry and are slurried, and the substances such as coal tar and lime-ash are deposited In the energy value for increasing water-coal-slurry.

In the present invention, the main source for preparing the water of water-coal-slurry is waste water, and the source of coal substance is mainly coal dust.It will be upper Waste water is stated, coal dust is mixed with slurries additive agent solution, and water-coal-slurry can be obtained, and the concentration of water-coal-slurry is greater than 64.1wt%；It is viscous Degree is less than 1200mPas (at 20 DEG C of slurry temperature, shearing rate 100S-1)；Calorific value is greater than 18.51MJ/kg.

In addition, the present invention, which can also be used in technical process, generates other coal substances and water resource as preparation water-coal-slurry Raw material.

Preferably, the exhaust gas that will be generated in drying course, remaining gas passes through again after first passing through the processing of the first dust collecting process Condensation process handles to obtain waste water, the source of water when this effluent part can also be used as preparation water-coal-slurry, to supplement waste water not The shortage of water resource when sufficient, while also improving the utilization rate of water resource in low-order coal.

Preferably, the upgraded coal screening that the reducing process that gasifies is handled is obtained into the coal dust that granularity is less than 1mm, is used as system The supplement of the coal resource of standby water-coal-slurry, the upgraded coal of granularity less times greater than 1mm directly can sell or do stored energy source.

It preferably, is the source for doing the coal substance of preparation water-coal-slurry, greasy filth by the greasy filth generated during oil gas bosher As preparation water-coal-slurry, the resource in greasy filth can be made full use of.

As the further improvement of technique in the present invention, in water-coal-slurry and O₂Before being handled by coal-water slurry gasification, water Coal slurry is first handled through filter pulp.Considering slurry purpose is to remove the coarse granule occurred during water-coal-slurry processed and be mixed into the certain miscellaneous of slurry Object, to prevent water coal slurry blocking pipeline and nozzle etc. in storage and transportation and combustion process.

By the water-coal-slurry and O of above-mentioned preparation₂It is obtained together by coal-water slurry gasification comprising CO and H₂Second synthesis Gas, coal substance and O of the key reaction water-coal-slurry by in coal-water slurry gasification₂In burnup heat release, coal substance and water-coal-slurry Water reaction generate CO and H₂.Here O₂It can be pure oxygen, be also possible to the oxygen rich gas of high-purity.Coal substance and H₂O (water Steam) reaction be the endothermic reaction, reaction equation C+H₂O=CO+H₂, first it is passed through O₂So that a part of a small amount of water-coal-slurry In coal substance combustion heat release so that environment temperature is rapidly achieved 800-1300 DEG C, then be passed through another part water-coal-slurry and water Steam reacts at this temperature generates CO and H₂, obtained gas is synthesis gas.In the actual production process, general using continuous Uninterruptedly it is passed through O₂And vapor, so that coal substance and H in water-coal-slurry₂O (vapor) reacts continual preparation synthesis The calorific value of gas, synthesis gas is high.

Finally mixing the first synthesis gas and the second synthesis gas can be obtained product synthesis gas.Pass through both the above approach system Standby synthesis gas takes full advantage of the coal dust generated in volatile matter, waste water and drying course in low-order coal, the utilization rate of low-order coal It is high.

As shown in Figure 2-5, synthesis gas is prepared using volatile matter in low-order coal and waste water invention also provides a kind of System, including drying unit 100, gasification reduction apparatus 10, the first dust-extraction unit 200, the second dust-extraction unit 300, oil gas are cooling Device 400, desulfurizer 800, reforming reactor 900, water-coal-slurry mixing arrangement 500, gasification furnace 600 and synthesis gas storage Tank 700, the drying unit 100 are connect by the feeding device 11 that gasifies with the gasification reduction apparatus 10, the drying unit 100 discharge port is connect with first dust-extraction unit 200, the upper end of the gasification feeding device 11 and the second dust-extraction unit 300 connections, second dust-extraction unit 300 are sequentially connected with the oil gas cooling device 400, desulfurizer 800, the desulfurization Device 800 is connect with the reforming reactor 900, and the oil gas cooling device 400, the first dust-extraction unit 200 are and water Coal slurry mixing arrangement 500 connects, and the water-coal-slurry mixing arrangement 500 is connect with the gasification furnace 600, the reforming reaction Device 900, gasification furnace 600 are connect with the synthesis gas storage tank 700.

When raw material low-order coal is fine coal, low-order coal can be conveyed directly through conveying devices such as helix transporting device, crawler belts It is dried into drying unit 100.When low-order coal is lump coal, bulky grain needs to obtain using after broken crusher machine, screening machine screening The low-order coal of smaller particle size is obtained, then conveying device enters the drying of drying unit 100.

Wherein, drying unit 100 includes roller, conveying device, multiple heating tubes and driving mechanism through roller, roller Be equipped with feed inlet, discharge port and gas outlet, low-order coal enters roller from feed inlet, driving mechanism to drive roller to rotate, Heat medium such as vapor is equipped with lifting blade, lifting by the low-order coal indirect heat transfer in heating tube and roller, inner wall of rotary drum For plate along inner wall of rotary drum around distribution, heating tube is alternately distributed in drums inside in length and breadth, and roller can horizontally disposed or inclination cloth It sets, when drum-inclined is arranged, roller and horizontal plane are arranged to certain gradient, and one end that roller is equipped with discharge port is in low level, Guarantee that the height of drum front end is higher than the height of roller rear end, the low-order coal after drying can pass automatically under the effect of gravity Defeated to be discharged from discharge port, the low-order coal after drying enters subsequent gasification reduction apparatus 10 through conveying device, conveying dress here The conveying device preferably sealed is set, to prevent outside air to be mixed into the low-order coal after drying during transportation, consumes coal resource； The exhaust gas such as the fugitive dust, the vapor that generate in drying course are discharged from the gas outlet of roller；It is further preferred that the gas outlet of roller Be with the discharge port of roller it is same, the low-order coal after as drying and the exhaust gas comprising coal dust rush the discharge port of roller respectively Discharge, low-order coal and exhaust gas after as drying rush the discharge port discharge of roller respectively.

The exhaust gas being discharged from the discharge port of drying unit 100 enters the first dust-extraction unit 200.First dust-extraction unit 200 is Deduster, is arranged in the discharge port of drying unit 100, primarily to removing in exhaust gas a large amount of fugitive dust and by this part fugitive dust It collects.Deduster includes one or more of bag filter, gravitational precipitator and cyclone dust collectors etc., can remove expense The a large amount of dust in.Preferably, sack cleaner is used in the present invention.Sack cleaner biggest advantage is efficiency of dust collection Height, up to 99.99% or more, the fugitive dust concentration in discharge gas is up to 10mg/m³Hereinafter, and classification efficiency it is also very high, to 2.5 μm Fine particle below also has good arresting efficiency, therefore is widely used.System is being advanced optimized, in dedusting Air-introduced machine is installed in the rear end of device, the gas in the exhaust gas and deduster in drying unit 100 will be driven by air inducing machine negative pressure. The model and Fan Selection of air-introduced machine need to be depending on the coal drying capacities in roller.Commercially available conventional air inducing can be selected in air-introduced machine Machine meets production capacity.

Preferably, exhaust gas remaining gas after 200 dedusting of the first dust-extraction unit, which enters back into condensing unit 800, obtains Two waste water, make-up water source of second waste water as subsequent preparation water-coal-slurry.

In addition, the dust of the accumulations such as on drying equipment mesospore or dead angle, the ash that each appliance arrangement maintenance generates when clearing up The dust that is generated in dust-extraction unit after dirt and gasification reduction, all can serve as subsequent preparation water-coal-slurry coal source.

Connected by treated the low-order coal of drying unit 100 using gasification feeding device 11 and gasification reduction apparatus 10 It connects, gasification feeding device 11 is helix transporting device, and the low-order coal after drying is fed from the discharge port of drying unit 100 through gasification The feed inlet 2 of gasification reduction apparatus 10 is entered back into after device 11, gasification feeding device 11 at this time is both the defeated of material after drying Device is sent, enables the low-order coal after drying to be in further the single-size dispersed in gasification reduction apparatus 10, is heated evenly Convenient for the reduction reaction that gasifies occurs, and improve the temperature when low-order coal after drying enters in gasification reduction apparatus 10.

Wherein, as shown in figure 3, gasification feeding device 11 includes gasification feed cavity and is arranged in the gasification feed cavity The gasification motor 112 that helical blade 111 and driving helical blade 111 rotate, the cross section of helical blade 111 are not more than gas Change the internal diameter cross section of feed cavity.

Gasification feeding device 11 may be provided at the discharge port 3 or feed inlet 2 of gasification reduction apparatus 10.Gasification charging dress It sets 11 upper end to connect with subsequent second dust-extraction unit 300, when gasification reduction apparatus 10 is arranged in gasification feeding device 11 When at discharge port 3, the low-order coal after drying enters gasification reduction apparatus 10, the oil that gasification reduction apparatus 10 generates through conveying device Gas mixture is introduced into gasification 11 upper end of feeding device through discharge port 3 and enters back into subsequent second dust-extraction unit 300, then gasifies The upgraded coal of output is delivered to next system through gasification feeding device 11 from discharge port 3 in reduction apparatus 10, and gasify feeding device 11 be only the conveying device of the gas mixture transfer passage and upgraded coal after gasifying reduction reaction.

Low order when at the feed inlet 2 that gasification reduction apparatus 10 is arranged in feeding device 11 that gasifies, after on the one hand drying Coal by gasification feeding device 11 conveying and the single-size for being dispersed into suspension that gasifies after enter back into gasification reduction apparatus 10 into Material mouth 2, at the same gasify reduction apparatus 10 generation gas mixture through feed inlet 2 be introduced into gasification 11 upper end of feeding device again into Enter subsequent second dust-extraction unit 300, the gas mixture of high temperature and the low-order coal after drying are sent out in gasification feeding device 11 Heat exchange is conducive to improve the temperature that the low-order coal after drying enters gasification reduction apparatus 10, and therefore, gasify feeding device 11 It is both the conveying device of material after drying, so that the low-order coal after drying is in the single-size dispersed in gasification reduction apparatus 10, It is heated evenly convenient for reacting；Low-order coal after improving drying again enters the temperature of gasification reduction apparatus 10.Therefore preferably, Gasification feeding device 11 is arranged at the feed inlet 2 of gasification reduction apparatus 10.

Gold is arranged on the outside of the feed inlet 2 of gasification feed cavity and the reduction apparatus 10 that gasifies in leakproofness in order to further increase Belong to compensator and dynamic and static sealing device 9, to increase leakproofness and the company between gasification feeding device 11 and gasification reduction apparatus 10 Connect stability.

As illustrated in figures 4-5, gasification reduction apparatus 10 is rotatable horizontal reacting kettle 1, and further preferred 360 ° rotatable Horizontal reacting kettle 1, gasification reduction apparatus 10 include 360 ° of rotatable horizontal reacting kettles 1, the first heating mechanism 5 and driving The driving mechanism 4 that the horizontal reacting kettle 1 rotates, first heating mechanism 5 are connect with the horizontal reacting kettle 1 to described Low-order coal heating after drying in horizontal reacting kettle 1；The horizontal reacting kettle 1 is provided with discharge port 3 and feed inlet 2, drying Low-order coal afterwards enters from the feed inlet 2, and gasification restores counter obtained upgraded coal by being arranged in the horizontal reacting kettle 1 Deflector 7 from 3 output of discharge port, the gas mixture generated in horizontal reacting kettle 1 is discharged from the feed inlet 2.

Driving mechanism 4 includes that the ring gear 41 of 1 one end outer peripheral surface of horizontal reacting kettle, the support roller engaged with ring gear 41 is arranged in 42, transmission gear 44 and motor 43, motor 43 drive transmission gear 44 to rotate, and the rotation of support roller 42 are further driven to, with band again Movable tooth ring 41 and horizontal reacting kettle 1 rotate, what needs to be explained here is that, driving mechanism 4 is also possible to other device, as long as can Reach identical technical effect.

The horizontal reacting kettle 1 rotates to be 360 ° of rotations, so that when low-order coal after its internal drying It carves and is in rotary state, to increase the heating surface area of heat medium provided by low-order coal and the first heating mechanism 5 after drying, Be conducive to accelerate the low order coal gasification reduction reaction after drying, wherein the first heating mechanism 5 is by transmitting heat medium to sleeping Low-order coal after drying in formula reaction kettle 1 carries out continuous heating and continues that gasification reduction occurs, so that the low-order coal after drying Gas mixture and upgraded coal can be generated to greatest extent, to generate at most while using least heating resource Coal Energy Source utility value.

First heating mechanism 5 include heater 51 and heater box 52, the heater 51 by heating pipe 53 with The heater box 52 connects, and the heater box 52 is set in 1 outside of horizontal reacting kettle and passes through sound with horizontal reacting kettle 1 Sealing device 9 connects.It is designed using such structure, prevents heat medium from leaking and improve capacity usage ratio, and eventually by adding Heat medium is discharged for hot gas outlet 54, so that the first heating mechanism 5 forms two sets of relatively independent machines with horizontal reacting kettle 1 Structure, therefore can be according to actual production scene, the better occupied space for arranging whole system, while it is also possible that Heat medium can carry out lasting heat exchange with the low-order coal in horizontal reacting kettle 1, in order to increase the steady of the first heating mechanism 5 It is qualitative, the first heating mechanism 5 can be fixedly installed, such as the first heating mechanism 5 can fix on the ground or bracket on. It is further preferred, it is equipped with the attemperators such as heat-preservation cotton outside heater box 52, prevents the temperature of the first heating mechanism 5 from reducing. Further preferred, heating pipe 53 can be more, and more heating pipes 53 are passed through from the different location of bedroom reaction kettle 1 Heat medium simultaneously heats the heat medium discharge after gas outlet 54 utilizes heat exchange, accelerates the rate of gasification reduction reaction.

Wherein, the second heating mechanism 6 is equipped with inside horizontal reacting kettle 1, so that being heated evenly inside horizontal reacting kettle 1.Into One step, the second heating mechanism 6 will be in horizontal reacting kettle 1 by flow velocity, the temperature and pressures of heat mediums such as control flue gas etc. Drying after low-order coal be evenly heated；First heating mechanism 5 adds the low-order coal after drying from the outside of horizontal reacting kettle 1 Heat enables the low-order coal after drying with horizontal reacting to realize flowing of the heat medium inside and outside horizontal reacting kettle 1 Kettle 1 touches a large amount of heat while rotation, preferably to carry out gasification reduction reaction, improves the efficiency of gasification reduction reaction And rate.

Wherein, deflector 7 be single coil configuration and/or double-spiral structure, by be in tilted layout and helically structure and/or The deflector 7 of single coil configuration is arranged, and the low-order coal after the drying in horizontal reacting kettle 1 is constantly carried out to the same of gasification reduction When the upgraded coal of generation be transported to discharge port 3 be discharged, then the rotation of horizontal reacting kettle 1 is combined with, so that low-order coal is passing through Deflector 7 can more fully carry out gasification reduction reaction during transporting, wherein deflector 7 divide for water conservancy diversion steel plate and Single coil configuration or double-spiral structure can be used in water conservancy diversion stainless steel plate, can also the spiral stream guidance structure of single, double combination led Stream is designed using such structure, during horizontal reacting kettle 1 rotates, so that low after drying in horizontal reacting kettle 1 Rank coal is mobile to discharge port 3 under the action of spiral deflector 7, product after accelerating the interior reduction reaction that gasified of horizontal reacting kettle 1 The discharge of upgraded coal.

Gasification reduction apparatus 10 is set as at least level-one.The horizontal reacting kettle of at least one level can be set as needed, To carry out more sufficiently complete gasification reduction to low-order coal, while the inlet amount of gasification reduction low-order coal can also be increased, together When 360 ° of rotatable horizontal reacting kettles it can be made internal drying after low-order coal be kept in motion always, with more It is comprehensively uniform heated.Wherein, preferably horizontal reacting kettle includes level-one horizontal reacting kettle and second level horizontal reacting kettle in the present invention, By the conveying device connection of sealing between the level-one horizontal reacting kettle and second level horizontal reacting kettle, conveying device here is Gasify feeding device 11.Low-order coal after drying is from the level-one gas and level-one solid after the reaction of level-one horizontal reacting kettle, level-one Gas enters subsequent second dust-extraction unit 300 from the upper end of gasification feeding device 11, and level-one solid is through the feeding device 11 that gasifies Secondary gas and second level solid are obtained into the reaction was continued in second level horizontal reacting kettle, second level solid is upgraded coal, second level gas Body enters subsequent second dust-extraction unit 300 from the upper end of gasification feeding device 11.

Preferably, the capacity of second level horizontal reacting kettle is less than the capacity of the level-one horizontal reacting kettle.It is low after drying After the gasification reduction that rank coal passes through level-one horizontal reacting kettle, a certain amount of gas mixture can be generated, at this time remaining solid The amount of coal will greatly reduce, then after the capacity of second level horizontal reacting kettle is reduced, it can better meet surplus The gasification again of remaining solid coal restores, therefore such design, more the capacity of device is utilized rationally and adequately, and save Space occupied, improves the reasonability of system.

Wherein, after low-order coal is restored by the gasification of level-one horizontal reacting kettle, the volatile matter content in upgraded coal is 8-15wt%, after low-order coal is restored by the gasification of second level horizontal reacting kettle, the volatile matter content in upgraded coal is 3- 8wt%.Specific related with reaction temperature, the type of low-order coal, principal element is decided by reaction temperature.

Wherein, multiple wireless temperature controllers are additionally provided with inside horizontal reacting kettle 1.Wireless temperature controller is sleeping for monitoring Temperature in formula reaction kettle 1, and send temperature signal to backstage or alarm device, so that staff monitors gasification in real time also The carry out situation of original reaction improves the controllability of gasification reduction reaction and the safety of reaction.When 3 temperature of equipment discharge port When not reaching assigned temperature also, temperature sensor sends computer and alarm device to by signal conveying, reminds staff, this Be to illustrate that product does not reach Eligibility requirements also, at this time take measures main as follows, horizontal reacting kettle 1 can invert, make near The solid material of discharge port 3 is again introduced into horizontal reacting kettle 1 and sufficiently reacts, and extends the residence time, while continuing to heat, Horizontal counter Answering 1 reversing time of kettle is that 30min-4h is differed, and then horizontal reacting kettle 1 rotates forward, when solid material enters discharge port 3, observation Whether temperature sensor alarms, if alarm, horizontal reacting kettle 1 invert again, so repeats, and guarantees that product qualification is offline.If Temperature sensor displays temperature is up to standard, and solid matter, that is, upgraded coal after reaction enters discharge port 3, conveys through conveying device from sleeping The discharge port 3 of formula reaction kettle 1 is discharged.

The gas mixture of high temperature enters in the second dust-extraction unit 300 from the upper end of gasification feeding device 11 removes dust, Second dust-extraction unit 300 includes one or more of gravitational dust collecting device, cyclone separator and electrical dust collector device.Second removes Dirt device 300 can be kept the temperature with heat-preservation cotton etc., as far as possible declined the temperature of gas mixture and be unlikely to too fast, if temperature declines It is too fast, diesel oil etc. is easily cooled to droplet formation liquid, causes coal tar to be adhered in the second dust-extraction unit 300 and results in blockage. Dust return gasification through removing in the second dust-extraction unit 300 goes back original system and melts down reaction, and the dust of this part also can be used as system The source of the coal of standby water-coal-slurry.

Enter oil gas cooling device 400 by the gas after 300 dedusting of the second dust-extraction unit, oil gas cooling device 400 wraps Include cooling device, oil water separator and automatic scraper filter.Cooling device utilizes industrial wastewater after cooling either heavy oil Etc. cooling mediums make the oil water mixture for being transformed into liquid after tar in gas mixture and vapor are cooling so that Grease is separated with gas.Gas mixture generates impurity with the cooling liquid accumulation of downlink into greasy filth in cooling procedure, When a certain amount of greasy filth is arrived in accumulation, the liquid of the greasy filth containing high concentration is discharged automatic scraper filter, and on-condensible gas is filled from cooling The gas outlet discharge set.Common cooling device such as cooling tower etc., as long as can achieve the effect that cooling cooling device；Oil Aqueous mixtures enter oil water separator, and the You Heshui in oil water mixture after cooling is separated, coal tar and waste water are obtained.

Remaining gas enters desulfurizer 800 after being handled by oil gas cooling device 400, to remove sulfur-bearing chemical combination Object obtains mixed gas.Cooled coal gas desulfurization can be generally divided into two methods of dry desulfurization and wet desulphurization, and dry desulfurization is with oxygen Change iron processes and activated carbon method application is wider, and wet desulphurization has much representativeness with arsenic alkaline process, ADA, modified ADA and tannin process.? In the Wet Flue Gas Desulfurization Technique of producer gas, widely used is tannin extract doctor treatment.It is using soda ash as absorbent, with Tannin extract is oxygen carrier, with NaVO₂For oxidant.The entire desulfurization of wet type desulfurizing tanning extract and regenerative process be continuously in line process, Desulfurization carries out simultaneously with regeneration, does not need that spare desulfurizing tower is arranged；Coal gas desulfurization degree of purification can pass through according to enterprise's needs Solution ratio adjustment is adjusted, is controlled in due course, H in coal gas after purification₂S stable content.Preferred wet type tannin process in the present invention Desulfurization, desulfurizer 800 are wet desulfuration tower.

Mixed gas enters reforming reactor 900, and reforming reactor 900 is equipped with air inlet and air outlet.When When converting using Partial Oxidation, oxygen and vapor are passed through reforming 900 combustion heat supplying of reactor, in catalyst Under effect, the hydro carbons such as methane in mixed gas and vapor react and generate mainly comprising CO and H₂The first synthesis gas； When using vapor catalyzed reforming, external heating heated reformate conversion reactor 900 is needed, vapor is passed through into air inlet It is passed through in reforming reactor 900, under the effect of the catalyst, the gas being discharged from the gas outlet of reforming reactor 900 Body includes as CO and H₂The first synthesis gas；It is converted when using on-catalytic reforming, external heating heated reformate conversion reactor 900, oxygen is passed through in reforming reactor 900 and obtains including mainly CO and H with hydrocarbon reaction, reaction₂First synthesis Gas.

Above-mentioned waste water, slurries additive agent and coal dust are delivered to and mixed in coal slurry mixing arrangement 500 to finally obtain Water-coal-slurry, wherein water-coal-slurry mixing arrangement 500 mainly includes blending tank, blender and filter pulp device.Coal dust after weight calculation is added Enter a certain amount of waste water, slurries additive agent mixes in blending tank, is stirred evenly using blender, obtain product water-coal-slurry. Since coal dust of the present invention is the low-order coal of the small grain size during drying unit 100 in the exhaust gas of generation, air-flow institute The low-order coal brought out, uniform granularity can greatly save the cost of defibrination machine equipment and prolong the service life.The mesh of stirring Be sufficiently mixed coal dust, waste water water and slurries additive agent, improve the stability of water-coal-slurry, and make water in whipping process Coal slurry is strengthened the interaction of slurries additive agent Yu coal dust surface, improves the mobility of slurry by the processing of Strong shear power. The purpose of filter pulp is to prevent the water-coal-slurry of preparation from containing large particulate matter, causes slurries uneven.

Furthermore it is also possible to which waste water obtained in above-mentioned condensing unit is gone back the resulting upgraded coal of original system 10 warp from gasification The greasy filth generated in the coal dust and oil gas cooling device 400 that screening plant screening obtains, is delivered to coal slurry mixing arrangement As the water resource of preparation water-coal-slurry and the supplemental resources of coal substance in 500.

By the water-coal-slurry and O of above-mentioned preparation₂It is passed through in gasification furnace 600 and reacts together, can be obtained after reaction comprising CO and H₂ The second synthesis gas, synthesis gas enters synthesis gas storage tank 700 as stored energy source.Gasification furnace 600 mainly include multistage nozzles, Water-coal-slurry channel, oxygen channel and slag-draining device, water-coal-slurry spray into gasification furnace 600, O by the nozzle in water-coal-slurry channel₂Pass through Oxygen channel sprays into gasification furnace 600, coal substance and moisture and O in water-coal-slurry₂It is chemically reacted inside gasification furnace 600 It generates with CO, H₂Second synthesis gas as main component, while a large amount of thermal energy are discharged, fail to react remaining water containing solid waste from gas Change the slag-draining device discharge of furnace bottom.

Finally, the first synthesis gas and the second synthesis gas are mixed in synthesis gas holding vessel 700, product synthesis can be obtained Gas.

In conclusion the method in the present invention, the volatile matter being not only effectively utilized in low-order coal prepares synthesis gas, and And the moisture in low-order coal and coal dust are effectively recycled for making water-coal-slurry by water-coal-slurry preparing synthetic gas, wastewater through organic matter Content is high, complicated component, causes cost for wastewater treatment high, and useless water reuse solves the problems, such as discharged wastewater met the national standard difficulty, The advantage that organic compound combustion calorific value is high in waste water is taken full advantage of, while solving the problems, such as that coal utilization is low.And this hair System equipment in bright is simple, easy to operate, mostly existing equipment, and operating cost is lower.

The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.

Claims

1. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water, it is characterised in that: walked including following technique It is rapid:

(1), low-order coal and exhaust gas after low-order coal drying process is dried, the exhaust gas pass through the first dust collecting process Processing obtains coal dust；

(2), the low-order coal after drying described in step (1) is handled to obtain gas mixture by the reducing process that gasifies, it is described The reducing process that gasifies is the chemical reaction process heated under anaerobic or micro-oxygen conditions to the low-order coal after drying；

(4), mixed gas described in step (3) is obtained through the reforming process of some hydrocarbon comprising CO and H₂First Synthesis gas；

(5), water-coal-slurry is obtained after mixing coal dust described in waste water described in step (3), step (1) with slurries additive agent, By the water-coal-slurry and O₂It handles to obtain comprising CO and H by coal-water slurry gasification₂The second synthesis gas；

(6), the second synthesis gas described in the first synthesis gas described in step (4) and step (5) is mixed to get the synthesis Gas.

2. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: purification process described in step (3) includes the second dust collecting process, oil gas cooling technique and sulfur removal technology.

3. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: the reaction temperature for the reducing process that gasifies described in step (2) is 350-800 DEG C.

4. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: reforming technique described in step (4) is Partial Oxidation, and the Partial Oxidation is to lead to pure oxygen and vapor Enter in mixed gas, some hydrocarbon and water under the conditions of existing for 850-1300 DEG C of the temperature and catalyst, in mixed gas Vapor reaction obtains CO and H₂。

5. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist Be in: reforming technique described in step (4) it is vapor catalyzed reforming, it is described vapor catalyzed reforming for by vapor It is passed through in mixed gas, under the conditions of indirect heating reaches temperature existing for 850-1200 DEG C and catalyst, in mixed gas Some hydrocarbon reacts to obtain CO and H with vapor₂。

6. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: reforming technique described in step (4) be on-catalytic reforming conversion, the on-catalytic reforming be converted into pure oxygen is passed through it is mixed It closes in gas, some hydrocarbon in mixed gas reacts to obtain CO and H with pure oxygen₂。

7. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: the granularity of coal dust described in step (1) is less than 1mm.

8. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: water-coal-slurry and O described in step (5)₂Before being handled by coal-water slurry gasification, the water-coal-slurry first passes through filter pulp technique Processing, then with O₂It is obtained by coal-water slurry gasification comprising CO and H₂Synthesis gas.

9. a kind of method for preparing synthesis gas using volatile matter in low-order coal and waste water as described in claim 1, feature exist In: it is additionally provided with gasification feeding process between the stoving process and gasification reducing process, described in the low-order coal warp after the drying Gasification feeding process processing enters back into the gasification reducing process after being separated into single-size.

10. a kind of system using such as any one of claim 1-9 the method, it is characterised in that: including drying unit (100), gasify reduction apparatus (10), the first dust-extraction unit (200), the second dust-extraction unit (300), oil gas cooling device (400), Desulfurizer (800), reforming reactor (900), water-coal-slurry mixing arrangement (500), gasification furnace (600) and synthesis gas storage Tank (700), the drying unit (100) is connect by gasification feeding device (11) with the gasification reduction apparatus (10), described The discharge port of drying unit (100) is connect with first dust-extraction unit (200), it is described gasification feeding device (11) upper end with Second dust-extraction unit (300) connection, second dust-extraction unit (300) and the oil gas cooling device (400), desulfurization fill It sets (800) to be sequentially connected, the desulfurizer (800) connect with the reforming reactor (900), the cooling dress of the oil gas It sets (400), the first dust-extraction unit (200) to connect with the water-coal-slurry mixing arrangement (500), the water-coal-slurry mixing arrangement (500) connect with the gasification furnace (600), the reforming reactor (900), gasification furnace (600) with the synthesis gas Storage tank (700) connection.