KR101758504B1 - A Method for Reducing Operation Temperature of SNG Gasifier by Using Wet Sludge of Lime Baking Process - Google Patents
A Method for Reducing Operation Temperature of SNG Gasifier by Using Wet Sludge of Lime Baking Process Download PDFInfo
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- KR101758504B1 KR101758504B1 KR1020150183708A KR20150183708A KR101758504B1 KR 101758504 B1 KR101758504 B1 KR 101758504B1 KR 1020150183708 A KR1020150183708 A KR 1020150183708A KR 20150183708 A KR20150183708 A KR 20150183708A KR 101758504 B1 KR101758504 B1 KR 101758504B1
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- Prior art keywords
- gasifier
- sng
- wet sludge
- sludge
- reducing
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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
- C10J3/72—Other features
- C10J3/723—Controlling or regulating the gasification process
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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
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/08—Production of synthetic natural gas
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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
- C10J2300/0983—Additives
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a method for reducing the operating temperature of a SNG gasifier in which wet sludge in a calcination process is added to a coal slurry to adjust the basic / acid ratio of the total ash to 0.4 to 0.7.
Description
The present invention relates to a method for reducing the SNG gasifier operating temperature in which the basic / acidic ratio of fly ash is limited to a certain range by using wet sludge in a calcination process.
Generally, a gasifier is a highly efficient clean facility that uses coal or heavy oil hydrocarbon fuels to produce power, chemicals, and industrial gases. In addition, the combustion material and the heavy metal material contained in the fuel supplied to the gasifier for generating syngas are configured to be discharged through the lower part of the gasifier.
In order to generate syngas using fossil fuels such as coal by basically operating the gasification plant, the temperature range and the steam amount in the gasifier are determined based on the already known theoretical calculations and experience, and the steam amount, the oxygen concentration, A method of independently controlling or, if necessary, re-selecting the target value depending on the judgment of the driver to find a stable condition is used. Since the gasification reaction in the gasifier changes the gasifier internal temperature and the synthesis gas composition according to the oxygen concentration, the fuel composition and the steam amount, the operating conditions must be changed and controlled in consideration of all three variables.
The SNG gasifier uses coal as a raw material and discharges the remaining fly ash after the production of Substituted Natural Gas (SNG) in the form of bottom slag. For the smooth discharge of slag, the SNG gasifier should generally maintain a temperature 100 ° C above the melting point. Therefore, the lower the melting point, the lower the energy consumption required to maintain the process temperature, and thus the operating temperature of the gasifier can be lowered.
Depending on the type of coal, the flux that can lower the melting point may be different, but the pure material is not economical due to its high price. Therefore, attempts have been made to lower the melting point of fly ash by utilizing byproducts or emissions from other processes. However, conventionally, there has been no technique using wet sludge, which is a by-product of a steel mill, to control the melting point of the gasifier.
Korean Patent Laid-Open Publication No. 2009-0032034 (published on Mar. 31, 2009) is directed to a low temperature gasification plant having a horizontally oriented gasifier, comprising a horizontally oriented gasifier, a gas reconstitution subsystem, Lt; / RTI > system that includes a conditioning system. However, the above-mentioned invention does not specifically mention attempts to lower the reflux point by adding and mixing other components to the coal slurry. The present invention is suitable for application to a dry gasifier, I still have it.
The inventors of the present invention focused on the fact that the melting point is changed according to the composition of the coal ash component and the composition of the wet sludge, which is a by-product of the steel mill, is similar to the ash component.
And to provide a way to economically lower the SNG gasifier operating temperature.
One embodiment of the present invention provides a method of reducing the SNG gasifier operating temperature by adding wet sludge from a lime firing process to a coal slurry to adjust the basic / acid ratio of the total ash to 0.4 to 0.7.
In addition, the basic / acidic ratio of the wet sludge in the calcination step added may be 14-15.
Further, when wet sludge is added to the coal slurry, it may be added so that the ratio of wet sludge to fly ash becomes 1: 2 to 1: 7.
Also, in one embodiment, a method for reducing the operating temperature of a SNG gasifier of the present invention includes the steps of: supplying wet sludge from a calcination process to a first stage of an SNG gasifier; And supplying the wet sludge of the calcination process to the second stage of the SNG gasifier.
Further, in the method of reducing the operating temperature of the SNG gasifier of the present invention, the melting point of the coal fly ash can be lowered by 80 to 100 ° C by controlling the melting point of the fly ash slag in the sludge calcining step in the calcination step.
Further, according to the method of reducing the operating temperature of the SNG gasifier of the present invention, the amount of coal used in the gasification process can be reduced by 1 to 2%.
Further, according to the method of reducing the operating temperature of the SNG gasifier of the present invention, the amount of oxygen used in the gasification process can be reduced by 1 to 2%.
The SNG gasifier operating temperature reduction method of the present invention can reduce the cost by reducing the gasifier operation temperature by using the sludge calcining process and reducing the amount of coal and oxygen used as the raw material. In addition, since the wet sludge of the calcination process can be recycled as an economically valuable flux, it is economical and environmentally friendly.
FIG. 1 shows the change of the coal fly ash with the basic / acid ratio of the total wastes when the wet sludge flux is added to the fly ash in the embodiment of the present invention.
The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
The method for reducing the operating temperature of the SNG gasifier according to the first embodiment of the present invention is characterized in that the wet sludge in the calcination step is added to the coal slurry to adjust the basic / acid ratio of the total components to 0.4 to 0.7 .
In addition, the basic / acidic ratio of the wet sludge in the calcination step added may be 14-15.
The wet sludge used in the method of reducing the operating temperature of the SNG gasifier of the present invention is a by-product obtained from the washing process in the lime calcining step of the steel mill, and the composition of the wet sludge flux is as follows.
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Generally, the gasifier operating conditions are defined as being 100 DEG C higher than the melting point of fly ash. The ratio of the components of the fly ash divided by the acidity and the basicity is referred to as a B / A ratio, and thus the melting point varies. CaCO 3, which is the main component of wet sludge, is a representative basic material and can be controlled by adding an appropriate amount to the coal slurry as a raw material. In Table 1, CaCO 3 is detected as CaO because of the dissociation of CO 2 during the analysis. Therefore, the CaCO 3 content of the wet sludge is considered to be about 93% considering the CO 2 contained in the other items (etc).
Further, when wet sludge is added to the coal slurry, it is preferable to add the wet sludge to the fly ash ratio of 1: 2 to 1: 7. However, the wet sludge addition ratio varies depending on the type of coal in the coal slurry, so the present invention is not limited thereto.
The wet sludge flux can also be added to and mixed with the rod mill together with the slurry (coal + water) used as the SNG gasifier raw material without further processing.
In addition, the type of coal of the coal slurry in the present invention is not limited to a specific one. For example, commonly used sub-bituminous coal.
Also, the method of reducing the operating temperature of the SNG gasifier of the present invention comprises the steps of: supplying wet sludge from a calcination process to the first stage of the SNG gasifier; And supplying the wet sludge of the calcination process to the second stage of the SNG gasifier.
Further, according to the method of the present invention, it is possible to apply a gasifier fluxing method that smoothly flows the slag while reducing the operating temperature of the gasifier by using the wet sludge of calcination process.
Further, according to the method of the present invention, the melting sludge of the lime firing process can control the melting point of the fly ash slag, thereby lowering the melting point temperature of the fly ash by about 80 to 100 ° C.
Further, according to the method of the present invention, the amount of coal used can be reduced by about 1 to 2% and the amount of oxygen used can be reduced by about 1 to 2% by using the wet sludge of the calcination process. Considering annual coal consumption, these figures are very significant for cost reduction.
Hereinafter, the present invention will be described in detail by way of examples. However, the scope of the present invention is not limited to the examples.
Example
A sample preparation method for measurement of coal fly ash is used as standardized in ASTM D1857 / D1857M-04. Melting point measurement instrument is LECO's AF-700 melting point analyzer, and it is used for general purpose.
Samples 1-7 were prepared by adding wet sludge fluxes to different basic / acid ratios of fly ash of 0.29, 0.4, 0.5, 0.7, 0.9, 1.1 and 1.3. The melting points of the samples 1-7 were measured, and the results are shown in Table 2 and FIG.
When the flux was not added, the basic / acid ratio of fly ash was 0.29 and the melting point was 1270 ° C. The addition of wet sludge flux changed the melting point according to the basic / acid ratio of fly ash. When the basic / acid ratio was 0.5, the melting point of 1170 ℃ could be obtained. Therefore, it was confirmed that the operation temperature of the gasifier can be lowered by using the wet sludge of the steel mill.
Claims (7)
A method of reducing the operating temperature of a SNG gasifier wherein wet sludge is added to the coal slurry so that the ratio of wet sludge to fly ash is from 1: 2 to 1: 7.
Feeding moist sludge of the calcination process to the first stage of the SNG gasifier; And
And supplying wet sludge of a calcination process to the second stage of the SNG gasifier.
Wherein the melting sludge controls the melting point of the fly ash slag, thereby lowering the melting point temperature of the fly ash by about 80 to 100 ° C.
A method for reducing the operating temperature of a SNG gasifier, wherein the amount of coal used is reduced by 1 to 2% in the gasification process.
A method for reducing the operating temperature of an SNG gasifier, wherein the amount of oxygen used is reduced by 1 to 2% in the gasification process.
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| CN115261097B (en) * | 2022-09-06 | 2024-01-19 | 山西潞安煤基清洁能源有限责任公司 | Preparation method of raw material coal fluxing agent of liquid slag-discharging gasifier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000087048A (en) * | 1998-09-14 | 2000-03-28 | Nippon Steel Corp | Coal hydrocracking |
| JP2013170236A (en) | 2012-02-21 | 2013-09-02 | Central Research Institute Of Electric Power Industry | Coal gasification equipment and coal gasification power generation system |
| JP2015025091A (en) * | 2013-07-29 | 2015-02-05 | 電源開発株式会社 | Operational method of gasification furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000087048A (en) * | 1998-09-14 | 2000-03-28 | Nippon Steel Corp | Coal hydrocracking |
| JP2013170236A (en) | 2012-02-21 | 2013-09-02 | Central Research Institute Of Electric Power Industry | Coal gasification equipment and coal gasification power generation system |
| JP2015025091A (en) * | 2013-07-29 | 2015-02-05 | 電源開発株式会社 | Operational method of gasification furnace |
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