CN105779008A - Coal dust processing method and system - Google Patents
Coal dust processing method and system Download PDFInfo
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- CN105779008A CN105779008A CN201610240238.0A CN201610240238A CN105779008A CN 105779008 A CN105779008 A CN 105779008A CN 201610240238 A CN201610240238 A CN 201610240238A CN 105779008 A CN105779008 A CN 105779008A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/466—Entrained flow processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/026—Dust removal by centrifugal forces
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/06—Modeling or simulation of processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0959—Oxygen
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- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
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- General Chemical & Material Sciences (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a coal dust processing method and system. The method comprises the steps that a circulating fluidized bed gasification system performs oxidation and reduction processing on coal dust for generating dust-contained gas, the dust-contained gas is subjected to dust removal processing to obtain fly ash and clean gas; the circulating fluidized bed gasification system conveys fly ash to an entrained flow bed gasification system through an ash bin to be used as a raw material; the entrained flow bed gasification system performs a gasification reaction on fly ash and oxygen to obtain raw gas, and the raw gas is subjected to chilling and dust removal processing to obtain clean gas and solid slag; the circulating fluidized bed gasification system and the entrained flow bed gasification system convey the obtained clean gas to a gas desulfurization system to be subjected to hydrogen sulfide removal processing to be output. The circulating fluidized bed gasification system and the entrained flow bed gasification system are combined, the entrained flow bed gasification system adopts fly ash of the circulating fluidized bed gasification system as a raw material, the problems that the circulating fluidized bed coal utilization rate is low and fly ash is large in amount and hard to process are solved, meanwhile, the technology is simplified, the coal conversion rate is improved, and the cost is low.
Description
Technical field
The present invention relates to coal utilization technology, particularly relate to processing method and the system of a kind of coal dust.
Background technology
In order to improve the utilization rate of coal, in some industries, it is necessary to coal is milled into powdery and carries out burning or further processing.At present, the processing method of conventional coal dust is to adopt ciculation fluidized bed gasification system that coal dust is carried out air gasification burning, then the remaining flying dust after burning is sent in pulverized coal boiler or other boiler and burns further, to utilize the after-heat in flying dust.But, due to non-volatile part of flying dust remaining in coal dust, difficulty of catching fire, and flying dust oxygen-excess combustion in boiler, reaction temperature is high, can produce nitrogen oxides, sulfide.It is thus desirable to build desulphurization denitration aid system, cause that coal dust utilizes in process in burning, complex process and relatively costly and the utilization rate of coal dust is relatively low.
Summary of the invention
The present invention provides processing method and the system of a kind of coal dust, for solving due to non-volatile part of flying dust remaining in coal dust, catch fire difficulty, and flying dust is oxygen-excess combustion in boiler, reaction temperature is high, can produce nitrogen oxides, sulfide, it is thus desirable to build desulphurization denitration aid system, cause that coal dust utilizes in process in burning, complex process and the problem relatively costly and utilization rate of coal dust is relatively low.
First aspect present invention provides the processing method of a kind of coal dust, the processing method of described coal dust is applied in the process system of coal dust, the process system of described coal dust includes ciculation fluidized bed gasification system, entrained flow bed gasification system, ash silo and desulphurization system, first outfan of described ciculation fluidized bed gasification system is connected by described ash silo with the input of described entrained flow bed gasification system, and the second outfan of described ciculation fluidized bed gasification system is connected with the input of described desulphurization system；The outfan of described entrained flow bed gasification system is connected with the input of described desulphurization system, then the Application way of described coal dust includes:
Described ciculation fluidized bed gasification system coal dust is carried out oxidoreduction process produce dust-laden coal gas, and described dust-laden coal gas is carried out dust removal process obtain flying dust and cleaning coal gas；
Described flying dust is delivered to described entrained flow bed gasification system by described ash silo by described ciculation fluidized bed gasification system；
Described flying dust and oxygen are carried out gasification reaction by described entrained flow bed gasification system, obtain raw gas, and by described raw gas Quench and dust removal process, obtain cleaning coal gas and solid-state slag；
Described ciculation fluidized bed gasification system and described entrained flow bed gasification system export after respectively the cleaning coal gas obtained transmission being carried out depriving hydrogen sulphide process to described desulphurization system.
Optionally, described flying dust is delivered to described entrained flow bed gasification system by described ash silo and includes as raw material by described ciculation fluidized bed gasification system:
Described flying dust is sent into described ash silo by Pneumatic ash conveying mode by described ciculation fluidized bed gasification system；
Described flying dust in described ash silo is sent into described entrained flow bed gasification system as raw material by Pneumatic ash conveying mode.
Optionally, described ciculation fluidized bed gasification system includes separator and dust removing units, then described dust-laden coal gas carries out dust removal process and obtains flying dust and cleaning coal gas, including
Described dust-laden coal gas is easily separated process and produces raw gas by described dust removing units；
Described raw gas is carried out dust removal process and obtains flying dust and cleaning coal gas by described dust removing units.
Optionally, described entrained flow bed gasification system includes normally low pressure gas generator, Quench unit and dust removing units, then described flying dust and oxygen are carried out gasification reaction by described entrained flow bed gasification system, obtain raw gas, and by described raw gas Quench and dust removal process, obtain cleaning coal gas and solid-state slag, including:
Described flying dust is carried out redox reaction by described normally low pressure gas generator when low-voltage high-temperature with oxygen, generates slag and raw gas；
Described slag and described raw gas are carried out Quench process by described Quench unit, obtain solid-state slag and raw gas；
Described raw gas is carried out dust removal process and obtains described cleaning coal gas by described dust removing units.
Second aspect present invention provides the process system of a kind of coal dust, including:
Ciculation fluidized bed gasification system, entrained flow bed gasification system, ash silo and desulphurization system, first outfan of described ciculation fluidized bed gasification system is connected by described ash silo with the input of described entrained flow bed gasification system, and the second outfan of described ciculation fluidized bed gasification system is connected with the input of described desulphurization system；The outfan of described entrained flow bed gasification system is connected with the input of described desulphurization system；
Described ciculation fluidized bed gasification system processes produce dust-laden coal gas for coal dust carries out oxidoreduction, and described dust-laden coal gas carries out dust removal process obtains flying dust and cleaning coal gas；
Described ciculation fluidized bed gasification system is additionally operable to by described ash silo, described flying dust is delivered to described entrained flow bed gasification system；
Described entrained flow bed gasification system, for described flying dust and oxygen are carried out gasification reaction, obtains raw gas, and by described raw gas Quench and dust removal process, obtains cleaning coal gas and solid-state slag；
Described desulphurization system is for exporting after the cleaning coal gas that described ciculation fluidized bed gasification system and described entrained flow bed gasification system produce respectively carries out depriving hydrogen sulphide process.
Optionally, described ciculation fluidized bed gasification system includes circle fluidized-bed gasification furnace, separator and dust removing units, and described circle fluidized-bed gasification furnace processes generation dust-laden coal gas for coal dust carries out oxidoreduction；
Described separator produces raw gas for described dust-laden coal gas is easily separated process；
Described raw gas is carried out dust removal process and obtains flying dust and cleaning coal gas by described dust removing units.
Optionally, described entrained flow bed gasification system includes normally low pressure gas generator, Quench unit and dust removing units；
Described normally low pressure gas generator, for described flying dust carries out with oxygen redox reaction when low-voltage high-temperature, generates slag and raw gas；Described Quench unit, for described slag and described raw gas are carried out Quench process, obtains solid-state slag and raw gas；Described dust removing units obtains described cleaning coal gas for described raw gas is carried out dust removal process.
The processing method of a kind of coal dust provided by the invention and system, by by gentle for ciculation fluidized bed gasification system fluidized bed gasification system in combination, it is attached by ash silo, coal dust is carried out oxidation processes and produces dust-laden coal gas by ciculation fluidized bed gasification system, and carry out dedusting obtain flying dust and cleaning coal gas, entrained flow bed gasification system adopts the flying dust of ciculation fluidized bed gasification system as raw material, this flying dust is carried out peroxide process, the cleaning coal gas that above-mentioned two system is produced by the desulphurization system carried in this system carries out desulfurization output, solve recirculating fluidized bed coal utilizaton rate low, the big intractable shortcoming of flying dust amount, Simplified flowsheet simultaneously, improve the conversion ratio of coal, reduce cost.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The configuration diagram of the process system embodiment of the coal dust that Fig. 1 provides for the embodiment of the present invention；
The flow chart of the processing method embodiment one of the coal dust that Fig. 2 provides for the embodiment of the present invention；
The processing method of the coal dust that Fig. 3 provides for embodiment of the present invention application schematic diagram in systems.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The configuration diagram of the process system embodiment of the coal dust that Fig. 1 provides for the embodiment of the present invention；As shown in Figure 1, the process system of this coal dust includes ciculation fluidized bed gasification system, entrained flow bed gasification system, ash silo and desulphurization system, first outfan of described ciculation fluidized bed gasification system is connected by described ash silo with the input of described entrained flow bed gasification system, and the second outfan of described ciculation fluidized bed gasification system is connected with the input of described desulphurization system；The outfan of described entrained flow bed gasification system is connected with the input of described desulphurization system.
In concrete application process, described ciculation fluidized bed gasification system processes produce dust-laden coal gas for coal dust carries out oxidoreduction, and described dust-laden coal gas carries out dust removal process obtains flying dust and cleaning coal gas；Described ciculation fluidized bed gasification system is additionally operable to described flying dust is delivered to described entrained flow bed gasification system as raw material by described ash silo；Conventional mode is the transmission adopting the mode of Pneumatic ash conveying to carry out flying dust.Described entrained flow bed gasification system, for described flying dust and oxygen are carried out gasification reaction, obtains raw gas, and by described raw gas Quench and dust removal process, obtains cleaning coal gas and solid-state slag；Described desulphurization system is for exporting after the cleaning coal gas that described ciculation fluidized bed gasification system and described entrained flow bed gasification system produce respectively carries out depriving hydrogen sulphide process.
Main, described ciculation fluidized bed gasification system includes circle fluidized-bed gasification furnace, separator and dust removing units, and described circle fluidized-bed gasification furnace processes generation dust-laden coal gas for coal dust carries out oxidoreduction；
Described separator (conventional cyclone separator) produces raw gas for described dust-laden coal gas is easily separated process；Described raw gas is carried out dust removal process and obtains flying dust and cleaning coal gas by described dust removing units.
Further, main production plant when ciculation fluidized bed gasification system is specifically applied includes: coal dust crushes and the device such as sending unit, circle fluidized-bed gasification furnace, cyclone separator, UTILIZATION OF VESIDUAL HEAT IN unit, slagging-off unit, bag-type dust unit, coal gas desulfurization unit, Pneumatic ash conveying unit.
Described entrained flow bed gasification system at least includes normally low pressure gas generator, Quench unit and dust removing units；Described normally low pressure gas generator is for carrying out redox reaction when low-voltage high-temperature with oxygen by described flying dust, generate slag and raw gas, described Quench unit is for carrying out Quench process by described slag and described raw gas, obtaining solid-state slag and relatively raw gas, described dust removing units obtains described cleaning coal gas for described relatively raw gas is carried out dust removal process.
The process system of the coal dust that the present embodiment provides, by by ciculation fluidized bed gasification system, entrained flow bed gasification system combination, entrained flow bed gasification system adopts the flying dust of ciculation fluidized bed gasification system as raw material, solution recirculating fluidized bed coal utilizaton rate is low, the big intractable shortcoming of flying dust amount, save entrained flow bed gasification system raw material to grind and drying unit simultaneously, Simplified flowsheet, improves the conversion ratio of coal；Meanwhile, the low-heat value gas of ciculation fluidized bed gasification system mixes with the high heating value gas of normally low pressure gas stream bed gasification system, it is achieved calorific value of gas is adjustable.
The flow chart of the processing method embodiment one of the coal dust that Fig. 2 provides for the embodiment of the present invention；As in figure 2 it is shown, on the basis of the system shown in above-mentioned Fig. 1, the step that implements of the processing method of this coal dust is:
S101: described ciculation fluidized bed gasification system coal dust is carried out oxidoreduction process produce dust-laden coal gas, and described dust-laden coal gas is carried out dust removal process obtain flying dust and cleaning coal gas.
In this step, by raw coal after crushing and screening, qualified coal dust is sent into this ciculation fluidized bed gasification system, carry out redox reaction, generate dust-laden coal gas, then be easily separated and punish and obtain cleaning coal gas and the higher flying dust of phosphorus content.
S102: described flying dust is delivered to described entrained flow bed gasification system by described ash silo by described ciculation fluidized bed gasification system.
In this step, when implementing, described flying dust is sent into described ash silo by Pneumatic ash conveying mode by described ciculation fluidized bed gasification system；Namely flying dust is sent into ash silo by the mode of one-level Pneumatic ash conveying, relends and helps pneumatic ash conveying plant that the described flying dust in described ash silo is sent into described entrained flow bed gasification system as raw material by Pneumatic ash conveying mode.Namely will the flying dust feeding entrained flow bed gasification system in ash silo be further processed again through two grades of pneumatic ash conveying plants.
Optionally, ciculation fluidized bed gasification system includes separator and dust removing units, it is possible to by dust removing units, described dust-laden coal gas is easily separated process and produces raw gas；By dust removing units, described raw gas is carried out dust removal process and obtain flying dust and cleaning coal gas.
S103: described flying dust and oxygen are carried out gasification reaction by described entrained flow bed gasification system, obtain raw gas, and by described raw gas Quench and dust removal process, obtain cleaning coal gas and solid-state slag.
In this step, during one implements, entrained flow bed gasification system includes the equipment such as normally low pressure gas generator, Quench unit and dust removing units, therefore described flying dust can be carried out redox reaction by described normally low pressure gas generator by this entrained flow bed gasification system when low-voltage high-temperature with oxygen, generates slag and raw gas；By Quench unit, described slag and described raw gas are carried out Quench process, obtain solid-state slag and relatively raw gas；By this dust removing units, described relatively raw gas is carried out dust removal process and obtain described cleaning coal gas.
S104: described ciculation fluidized bed gasification system and described entrained flow bed gasification system export after respectively the cleaning coal gas obtained transmission being carried out depriving hydrogen sulphide process to described desulphurization system.
It is arranged on the desulphurization system in the process system of whole coal dust for removing the H2S (hydrogen sulfide) in the cleaning coal gas obtained in above-mentioned two system, is then output to user.
The processing method of the coal dust that the present embodiment provides, by by gentle for ciculation fluidized bed gasification system fluidized bed gasification system in combination, it is attached by ash silo, coal dust is carried out oxidation processes and produces dust-laden coal gas by ciculation fluidized bed gasification system, and carry out dedusting obtain flying dust and cleaning coal gas, entrained flow bed gasification system adopts the flying dust of ciculation fluidized bed gasification system as raw material, this flying dust is carried out peroxide process, the cleaning coal gas that above-mentioned two system is produced by the desulphurization system carried in this system carries out desulfurization output, solve recirculating fluidized bed coal utilizaton rate low, the big intractable shortcoming of flying dust amount, Simplified flowsheet simultaneously, improve the conversion ratio of coal, reduce cost.
The processing method of the coal dust that Fig. 3 provides for embodiment of the present invention application schematic diagram in systems.On the basis of said method and system embodiment, as it is shown on figure 3, specifically introduce the process in systems of the processing method of this coal dust and flow process；
Ciculation fluidized bed gasification system main production plant includes: coal dust crushes and sending unit, circle fluidized-bed gasification furnace, cyclone separator, UTILIZATION OF VESIDUAL HEAT IN unit, slagging-off unit, bag-type dust unit, Pneumatic ash conveying unit.Main production is: raw coal is after crushing and screening, the fine coal of qualified particle diameter is transported to the circle fluidized-bed gasification furnace in circulating fluidized bed system, there is redox reaction in fine coal, generate the relatively low slag of coal gas, phosphorus content and the higher flying dust of phosphorus content in gasification furnace.The dust-laden coal gas produced enters cyclone separator and separates, bulky grain is separated by cyclone separator and returns gasification furnace continuation reaction, little granule is carried secretly entrance follow-up system by coal gas, the cyclone separator coal gas carrying fine particle flying dust out enters UTILIZATION OF VESIDUAL HEAT IN unit, produces hot-air and saturated vapor with air and water heat exchange respectively；Coal gas after cooling enters dust removing units, is separated by the flying dust in coal gas, and flying dust is sent to ash silo by Pneumatic ash conveying unit, is sent to entrained flow bed gasification system as raw material again through two grades of Pneumatic ash conveying unit；Coal gas after removing dust is sent to desulphurization system elimination H2S, is being sent to user through gas pressing unit；The slag amount produced is few and phosphorus content is low, can carry out concentrating outer selling as building materials materials etc..
The flying dust that circulating fluidized bed system produces, unburned carbon in flue dust is not less than 50%, the coal gas that ciculation fluidized bed gasification system produces, and adopts air gasification technique, and calorific value of gas is not higher than 1500kcal/Nm3。
Normally low pressure gas stream bed gasification system main production plant includes: feedstock transportation unit, normally low pressure gas generator, hybrid Quench unit, step waste heat recovery unit, slagging-off unit, wet-dry change combination dust removing units.Main production is: the reaction of ciculation fluidized bed gasification system is complete not, part carbon residue is carried secretly entrance follow-up system with the form of flying dust by coal gas, getting off dust pelletizing system is separated, the flying dust of carbon containing delivers to entrained flow bed gasification system as raw material through Pneumatic ash conveying unit.nullCirculating fluidized bed system flying dust first passes through feedstock transportation unit，Deliver to normally low pressure gas generator，At the high-temperature low-pressure of producer, (generally the high temperature at this place refers to more than 1450 degrees Celsius to carbon residue in recirculating fluidized bed flying dust，Can be preferably 1500 degrees centigrade，Low pressure refers to below 1Mpa) generate raw gas with oxygen reaction under reducing atmosphere，Major part ash element becomes molten slag at high operating temperatures，Slag and raw gas are after hybrid Quench unit Quench，Slag becomes solid granulates，Enter slagging-off unit under gravity，The flying dust that few partial particulate is tiny is carried secretly entrance step waste heat recovery unit by coal gas and is lowered the temperature，Saturated vapor or superheated steam is produced with water or steam heat-exchanging，Then enter dust removing units and will enter desulfurization unit after the ash fines particle separation in coal gas，The cleaner cleaning coal gas produced with circulating fluidized bed system enters in desulphurization system the H2S deviating from coal gas jointly，Obtain the cleaning coal gas finally exported.The few part flying dust separated by dust removing units carries out concentrating outer selling together as building materials raw material with the slag of airflow bed gasification furnace generation by the solid slag processed and phosphorus content is low.
The coal gas that normally low pressure gas stream bed gasification system produces, adopts high oxygen enrichment or pure oxygen gasification technique, and calorific value of gas is not less than 2000kcal/Nm3, can according to user's demand to calorific value of gas, two kinds of coal gas of differently configured ratio meet user's request.
The relatively cleaning coal gas of the high heating value that the low-calorie relatively cleaning coal gas produced by ciculation fluidized bed gasification system produces with entrained flow bed gasification system is by user's calorific value demand, proportioning is mixed into desulphurization system, H2S in elimination coal gas, making its content and utilize to industrial user place lower than delivering to after 20mg/Nm3, by-product sulfur can be sold.The mesolow saturated vapor of UTILIZATION OF VESIDUAL HEAT IN unit by-product and superheated steam, for process requirements or unit heat tracing.
In implementing, ciculation fluidized bed gasification system and normally low pressure gas stream bed gasification system, according to user's request flexible configuration number of units, can improve coal utilization efficiency, reduce three waste discharge.
The process system of coal dust provided by the invention and processing method, coal high-efficiency Application way by this recirculating fluidized bed with entrained flow bed gasification system combination, avoid the shortcoming that fixed bed gasification technology expense of raw materials is high, avoid ciculation fluidized bed gasification system flying dust amount difficult greatly, the shortcoming of efficiency of carbon con version；Save entrained flow bed gasification system feed coal and grind dry technological process.Meanwhile, ciculation fluidized bed gasification system produces the coal gas of different calorific values from entrained flow bed gasification system, can according to user's request flexible configuration calorific value of gas, strong adaptability.With it, make coal utilizaton rate be higher than 99%, coal gas dust content≤10mg/Nm3, H2S content≤20mg/Nm3, the pollutant emission such as nitrogenfree oxide, energy-saving and emission-reduction.
Avoid the shortcoming that fixed bed gasification technology expense of raw materials is high, it is to avoid ciculation fluidized bed gasification system flying dust amount is difficult greatly, the shortcoming of efficiency of carbon con version；Save entrained flow bed gasification system feed coal and grind dry technological process.Meanwhile, ciculation fluidized bed gasification system produces the coal gas of different calorific values from entrained flow bed gasification system, can according to user's request flexible configuration calorific value of gas, strong adaptability.The method changing conventional process recirculating fluidized bed flying dust, by the carbon residue Appropriate application in flying dust, is greatly improved coal utilizaton rate；The method calorific value of gas adjustability is strong, meets the industry demands to high heating value gas such as pottery, glass, metallurgy；Replace the method that low-heat value gas blends natural gas or liquefied gas, Simplified flowsheet.
The method increase coal utilizaton rate, make coal comprehensive utilization ratio reach more than 99%；Substitute glass, method that the field such as ceramic and metallurgical adopts the mode blending natural gas or liquefied gas to obtain high heating value gas, calorific value of gas adjustability is strong, Simplified flowsheet, reduces the operating cost of system；Reduce recirculating fluidized bed flying dust treating capacity, without the toxic emission such as sulfide, nitrogen oxides, reduce three waste discharge, clean environment firendly.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the processing method of a coal dust, it is characterized in that, the processing method of described coal dust is applied in the process system of coal dust, the process system of described coal dust includes ciculation fluidized bed gasification system, entrained flow bed gasification system, ash silo and desulphurization system, first outfan of described ciculation fluidized bed gasification system is connected by described ash silo with the input of described entrained flow bed gasification system, and the second outfan of described ciculation fluidized bed gasification system is connected with the input of described desulphurization system；The outfan of described entrained flow bed gasification system is connected with the input of described desulphurization system, then the Application way of described coal dust includes:
Described ciculation fluidized bed gasification system coal dust is carried out oxidoreduction process produce dust-laden coal gas, and described dust-laden coal gas is carried out dust removal process obtain flying dust and cleaning coal gas；
Described flying dust is delivered to described entrained flow bed gasification system by described ash silo by described ciculation fluidized bed gasification system；
Described flying dust and oxygen are carried out gasification reaction by described entrained flow bed gasification system, obtain raw gas, and by described raw gas Quench and dust removal process, obtain cleaning coal gas and solid-state slag；
Described ciculation fluidized bed gasification system and described entrained flow bed gasification system export after respectively the cleaning coal gas obtained transmission being carried out depriving hydrogen sulphide process to described desulphurization system.
2. method according to claim 1, it is characterised in that described flying dust is delivered to described entrained flow bed gasification system by described ash silo and includes as raw material by described ciculation fluidized bed gasification system:
Described flying dust is sent into described ash silo by Pneumatic ash conveying mode by described ciculation fluidized bed gasification system；
Described flying dust in described ash silo is sent into described entrained flow bed gasification system as raw material by Pneumatic ash conveying mode.
3. method according to claim 1, it is characterised in that described ciculation fluidized bed gasification system includes separator and dust removing units, then carry out described dust-laden coal gas dust removal process and obtain flying dust and cleaning coal gas, including
Described dust-laden coal gas is easily separated process and produces raw gas by described dust removing units；
Described raw gas is carried out dust removal process and obtains flying dust and cleaning coal gas by described dust removing units.
4. the method according to any one of claims 1 to 3, it is characterized in that, described entrained flow bed gasification system includes normally low pressure gas generator, Quench unit and dust removing units, then described flying dust and oxygen are carried out gasification reaction by described entrained flow bed gasification system, obtain raw gas, and by described raw gas Quench and dust removal process, obtain cleaning coal gas and solid-state slag, including:
Described flying dust is carried out redox reaction by described normally low pressure gas generator when low-voltage high-temperature with oxygen, generates slag and raw gas；
Described slag and described raw gas are carried out Quench process by described Quench unit, obtain solid-state slag and raw gas；
Described raw gas is carried out dust removal process and obtains described cleaning coal gas by described dust removing units.
5. the process system of a coal dust, it is characterised in that including:
Ciculation fluidized bed gasification system, entrained flow bed gasification system, ash silo and desulphurization system, first outfan of described ciculation fluidized bed gasification system is connected by described ash silo with the input of described entrained flow bed gasification system, and the second outfan of described ciculation fluidized bed gasification system is connected with the input of described desulphurization system；The outfan of described entrained flow bed gasification system is connected with the input of described desulphurization system；
Described ciculation fluidized bed gasification system processes produce dust-laden coal gas for coal dust carries out oxidoreduction, and described dust-laden coal gas carries out dust removal process obtains flying dust and cleaning coal gas；
Described ciculation fluidized bed gasification system is additionally operable to by described ash silo, described flying dust is delivered to described entrained flow bed gasification system；
Described entrained flow bed gasification system, for described flying dust and oxygen are carried out gasification reaction, obtains raw gas, and by described raw gas Quench and dust removal process, obtains cleaning coal gas and solid-state slag；
Described desulphurization system is for exporting after the cleaning coal gas that described ciculation fluidized bed gasification system and described entrained flow bed gasification system produce respectively carries out depriving hydrogen sulphide process.
6. system according to claim 5, it is characterised in that described ciculation fluidized bed gasification system includes circle fluidized-bed gasification furnace, separator and dust removing units, described circle fluidized-bed gasification furnace processes generation dust-laden coal gas for coal dust carries out oxidoreduction；
Described separator produces raw gas for described dust-laden coal gas is easily separated process；
Described raw gas is carried out dust removal process and obtains flying dust and cleaning coal gas by described dust removing units.
7. the system according to claim 5 or 6, it is characterised in that described entrained flow bed gasification system includes normally low pressure gas generator, Quench unit and dust removing units；
Described normally low pressure gas generator, for described flying dust carries out with oxygen redox reaction when low-voltage high-temperature, generates slag and raw gas；Described Quench unit, for described slag and described raw gas are carried out Quench process, obtains solid-state slag and raw gas；Described dust removing units obtains described cleaning coal gas for described raw gas is carried out dust removal process.
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