KR101436852B1 - Apparatus for treating fly ash and drain water of non-slagging gasifier and method thereof - Google Patents

Apparatus for treating fly ash and drain water of non-slagging gasifier and method thereof Download PDF

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Publication number
KR101436852B1
KR101436852B1 KR1020130051000A KR20130051000A KR101436852B1 KR 101436852 B1 KR101436852 B1 KR 101436852B1 KR 1020130051000 A KR1020130051000 A KR 1020130051000A KR 20130051000 A KR20130051000 A KR 20130051000A KR 101436852 B1 KR101436852 B1 KR 101436852B1
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South Korea
Prior art keywords
fly ash
cooling water
gasifier
gas
hydrogen sulfide
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Application number
KR1020130051000A
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Korean (ko)
Inventor
정석우
윤성필
황상연
이승종
윤용승
김대성
Original Assignee
고등기술연구원연구조합
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10JPRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72Other features
    • C10J3/82Gas withdrawal means
    • C10J3/84Gas withdrawal means with means for removing dust or tar from the gas
    • C10J3/845Quench rings
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10KPURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00Purifying combustible gases containing carbon monoxide
    • C10K1/002Removal of contaminants
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10KPURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00Purifying combustible gases containing carbon monoxide
    • C10K1/02Dust removal
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10KPURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00Purifying combustible gases containing carbon monoxide
    • C10K1/08Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/10Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
    • C10K1/101Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids with water only

Abstract

The present invention relates to an apparatus and method for treating a fly ash and discharge water of a non-melting gasifier, which, during gasification in an entrained-flow gasifier using non-melting technique, are capable of reducing a dust load in a dust collector by treating some heavy fly ash using a coolant of a quencher and recirculating the coolant to the gasifier without releasing a stinking gas into the atmosphere by separating a hydrogen sulfide gas into a liquid phase and a gas phase, wherein the hydrogen sulfide gas is discharged together with a coolant discharged from the quencher of the gasifier operated under a high pressure. More particularly, the present invention relates to an apparatus and method for treating a fly ash and discharge water of a non-melting gasifier, which includes: a circulation line resupplying, to the non-melting gasifier, the coolant discharged from the quencher of the non-melting gasifier, in which an ash is generated in a form of the fly ash, and having a opening/closing valve and a pump for transferring the coolant; a hydrocyclone installed on the circulation line and separating the fly ash collected in the coolant supplied from the quencher; a gas separator installed on the circulation line to be placed downstream of the hydrocyclone, and separating the hydrogen sulfide gas contained in the coolant; a gas combustion unit combusting the hydrogen sulfide gas separated by the gas separator; and a storage tank installed on the circulation line to be placed downstream of the gas separator, and storing the coolant circulating through the circulation line.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for treating fly ash and effluent of a non-fired gasifier,

The present invention relates to an apparatus and a method for treating fly ash and effluent of a nonfossil gasifier, and more particularly, to an apparatus and a method for treating fly ash and effluent from a nonfossil gasifier, And an apparatus and method for treating fly ash and effluent of a gasifier.

Generally, a gasifier is a high-efficiency facility for producing syngas to produce electric power, chemicals, industrial gas, etc. using hydrocarbon fuels such as coal or heavy oil. Through this gasifier, a synthesis gas containing hydrogen (H 2 ) and carbon monoxide (CO) is produced, and the fractionation bed gasifier is almost always in a molten state.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a melt gasifier according to the prior art;

As shown in FIG. 1, the melted gasifier 10 according to the prior art is supplied with pulverized coal and oxygen through a supply port 11 provided at the upper end thereof, and is gasified The reaction proceeds.

Also, among the components of the pulverized coal supplied to the inside of the molten gasifier 10, the organic component is converted into syngas mainly composed of hydrogen and carbon monoxide by the reaction with oxygen, and is discharged through the outlet 12 for the downstream process And some of the inorganic components, that is, ash escapes to the downstream process together with the syngas in the form of fly ash. However, almost all of the inorganic components are melted by the high temperature operation corresponding to about 1,450 to 1,700 ° C inside and flow on the inner wall 13 And falls into the coolant filled in the lower knob 14 to cool down.

Since the molten gasifier 10 continuously evaporates the cooling water as the high-temperature melting slack generated during normal operation falls to the cooling water of the stirrer 14, the cooling water is supplied through the supplementary water inlet 15, Are periodically supplemented. Further, the molten slack, which falls to the kneader 14 and is quenched, is stored in the kneader 14 for a predetermined period of time and is periodically discharged through the lower slack lock hopper 16.

The melted gasifier 10 having the above structure has an advantage that the gasification carbon conversion rate of the pulverized coal is high and the generation of fly ash can be greatly reduced by treating the inorganic component in the form of molten slag, Oxygen is required. Even if the operating temperature is slightly lower than the melting temperature of the inorganic component, the molten slack does not flow smoothly and becomes solidified, resulting in a problem of stopping the operation.

As a conventional method for treating fly ash, Korean Patent No. 10-0492619 (Registered on May 23, 2005), there is a method of treating fly ash with incineration of municipal waste, and it is possible that the fly ash collected in the dust collector is washed Or carbon dioxide generated during cement production is injected to dissolve and remove harmful substances such as chlorine and heavy metals contained in fly as much as the fly ash or a carbonic acid ion supply material such as sodium carbonate to remove heavy metal ions Is controlled to be equal to or less than the environmental regulation value.

However, such a conventional fly ash treatment method has a problem in that it is difficult to apply the method in the case of employing a cost-melting method in order to solve the disadvantage of the melting method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to solve the disadvantages of the above-mentioned conventional gasifier, And to prevent the generation of odor due to the hydrogen sulfide gas discharged together with the cooling water, and to enable the recirculation of the cooling water.

According to an aspect of the present invention, there is provided an apparatus for regenerating cooling water discharged from a non-fusing gasifier in which ash is generated in the form of fly ash, A circulation line in which a pump for transferring cooling water is installed; A hydrocyclone installed in the circulation line for separating the fly ash collected in the cooling water supplied from the combiner; A gas separator installed in the circulation line so as to be positioned at a rear end of the hydrocyclone and separating the hydrogen sulfide gas contained in the cooling water; A gas combustion unit for burning the hydrogen sulfide gas separated by the gas separator; And a storage tank installed in the circulation line so as to be positioned at a rear end of the gas separator and storing a cooling water circulated through the circulation line.

The level transmitter may further include a level transmitter for measuring the level of the touch sensor and outputting the sensed signal as a sensing signal. The valve may be a control valve operated by receiving a sensing signal output from the level transmitter.

The gas separator may be installed so that diaphragms are zigzagged on the inner side so as to change the direction of the flow path through which the cooling water and the hydrogen sulfide gas pass.

Wherein the gas combustion unit comprises: a gas transfer line installed to transfer hydrogen sulfide gas separated from the gas separator; A blowing fan installed in the gas transfer line; And a flare stack for burning hydrogen sulfide gas transferred through the gas line transmission line.

And a spray nozzle installed to spray cooling water re-supplied through the circulation line from the upper side of the shooter.

According to another aspect of the present invention, there is provided a method for separating fly ash, comprising the steps of: separating collected fly ash from cooling water discharged from a burner of a non-combustible gasifier where ash is generated in the form of fly ash; Separating the hydrogen sulfide gas contained in the separated cooling water from the fly ash; Combusting a hydrogen sulfide gas separated from the cooling water; And a step of re-supplying the cooling water into which the hydrogen sulfide gas is separated to the non-fusing gasifier.

The method may further include supplying oxygen to the non-fusing gasifier together with the pulverized coal before separating the fly ash, and causing the non-fusing gasifier to perform the gasification reaction at an operating condition of 1,000 to 1,200 ° C.

In the step of separating the hydrogen sulfide gas, the direction of the flow path through which the cooling water and the hydrogen sulfide gas pass is switched by the partition walls arranged in a zigzag manner, so that the hydrogen sulfide gas can be separated from the cooling water.

The step of re-supplying the cooling water to the non-fusing gasifier may spray the cooling water on the upper side of the dish by the spray nozzle while maintaining the water level at a predetermined level.

According to the present invention, in the gasification reaction in the non-cracking type gasifier, the total amount of fly ash generated together with the syngas is not treated in the dust collecting apparatus of the downstream process, And the dust load on the dust collecting apparatus can be reduced.

Further, according to the present invention, the hydrogen sulfide component gas escaping with the cooling water discharged from the gasifier operating at the high pressure condition is separated into the liquid phase and the gaseous phase, and the cooling water is supplied to the gasifier Can be recirculated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional melt blowing bed gasifier. FIG.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a non-
3 is a flow chart illustrating a method for treating fly ash and effluent of a non-fugitive gasifier according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

FIG. 2 is a configuration diagram illustrating an apparatus for treating flyash and effluent of a non-fugitive gasifier according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus 100 for treating fly ash and effluent of a non-combustible gasifier according to an embodiment of the present invention includes a non-combustible gasifier 200 in which inorganic components of ash, (Hydrocyclone) 120, a gas separator 130, a gas combustion unit 140, and a storage tank 150 (not shown) for treating hydrogen sulfide (H 2 S) ).

On the other hand, the unfossilized gasifier 200 is provided with a supply port 220 through which a powdery coal and oxygen are supplied, for example, at the upper end thereof, and causes a gasification reaction under high temperature and high pressure to discharge through the synthesis gas discharge port 230, The cooling water outlet 240 for discharging the cooling water is provided in the bowl 210 and the cooling water discharged through the cooling water outlet 240 is discharged through the inlet 250 through the injection nozzle 170 to the upper side of the knob 210.

In the case of a relatively light fly ash, the non-fired gasifier 200 is discharged through the syngas outlet 230 together with the syngas in the form of fly ash, The coolant is collected by the coolant in the cooler 210 by the injection of cooling water circulated and supplied. In addition, the non-combustible gasifier 200 can be operated as a gasification reaction at an operation condition of 1,000 to 1,200 ° C, so that ash can be generated as a fly ash.

The circulation line 110 is provided to provide a circulation path for re-supplying the cooling water discharged from the quencher 210 of the non-expandable gasifier 200 to the non-expandable gasifier 200, (111) and a pump (112) for transferring the cooling water.

The hydrocyclone 120 is installed in the circulation line 110 and may be installed at the rear end of the valve 111 and separates the fly ash collected in the cooling water supplied from the combiner 210 by the difference in specific gravity and the centrifugal force . The fly ash separated by the hydrocyclone 120 can be collected and transported for post-treatment.

The gas separator 130 is installed in the circulation line 110 so as to be located at the rear end of the hydrocyclone 120 and is generated by the gasification reaction of the non-fusing gasifier 200 to separate the hydrogen sulfide gas contained in the cooling water. The gas separator 130 separates the hydrogen sulfide gas from the cooling water by various methods including the difference in specific gravity and the like. In the present embodiment, the partition wall 132 is provided on the inner side so as to change the direction of the flow path 131 through which the cooling water and the hydrogen sulfide gas pass. May be arranged to be arranged in a zigzag manner.

The gas combustion unit 140 includes a gas transfer line 141 installed to transfer the hydrogen sulfide gas separated from the gas separator 130, A blowing fan 142 installed in the gas transfer line 141 and a flare stack 143 for burning the hydrogen sulfide gas transferred through the gas transfer line 141.

The storage tank 150 is installed in the circulation line 110 so as to be located at the rear end of the gas separator 130 and temporarily stores the cooling water circulated through the circulation line 110, To be supplied to the firearm 200 again.

On the other hand, a level transmitter (160) may be installed in the dishwasher (210) for level measurement. Here, the level transmitter 160 measures the level of the sensor 210 and outputs it as a sensing signal, and may be a single sensor or may be configured to measure the maximum and minimum levels respectively. The valve 111 is formed of a control valve and receives the sensing signal output from the level transmitter 160 to perform an opening and closing operation of the circulation line 110 so that the controller 210 maintains a predetermined water level or a predetermined water level range .

An injection nozzle 170 may be installed inside the non-fired gasifier 200. Here, the injection nozzle 170 is connected to the circulation line 110 through the inlet 250 of the non-fusing gasifier 200, and the cooling water, which is supplied again through the circulation line 110, It can be installed to spray downward, which is sprayed on the fly ash collected from the surface of the cooling water, and sinks fly ash into the cooling water.

A method for treating fly ash and effluent of a non-fired gasifier using the apparatus 100 for treating fly ash and effluent of a non-frying gasifier according to an embodiment of the present invention will now be described.

3 is a flowchart illustrating a method of treating fly ash and effluent of a non-fugitive gasifier according to another embodiment of the present invention.

As shown in FIG. 3, the ash collected from the coolant discharged from the combiner 210 of the non-combustible gasifier 200, which is produced in the form of fly ash, is separated (S12).

Meanwhile, before the fly ash is separated (S12), oxygen is supplied to the non-fired gasifier 200 together with the pulverized coal, and the non-fired gasifier 200 performs the gasification reaction under the operating condition of 1,000 to 1,200 ° C (S11). The pulverized gasifier 200 is supplied with pulverized coal and oxygen through a supply port 220 and is operated under high temperature and high pressure conditions so that the gasification reaction proceeds and the organic components of the pulverized coal are reacted with oxygen And is discharged through the syngas outlet 230 for a subsequent process while being converted into syngas which is mainly composed of carbon monoxide and hydrogen. At this time, unlike the conventional melting method, the operation of the non-fusing gasifier 200 is operated at a low temperature of about 1,000 to 1,200 ° C., so that the inorganic components in the pulverized coal, that is, ash is generated in the form of fly ash rather than molten slack, The fly ash flows out of the syngas outlet 230 through the syngas outlet 230 and is collected in a subsequent dust collecting process, and the relatively heavy fly ash bumps against the surface of the cooling water filled in the trough 210 by inertia and gravity in the downward direction Collecting is done.

On the other hand, in order to sink the fly ash collected on the surface of the cooling water of the combiner 210 through the sufficient contact with the cooling water, the cooling water is injected downward through the injection nozzle 170, So that the cooling water is sprayed on the cooling water. At this time, the fly ash collected through contact with the injected coolant is submerged in the coolant in the cooler 210, and the coolant and the fly ash collected therefrom are continuously discharged through the coolant outlet 240. As described above, the hydrogen sulfide component of the malodor component generated by the gasification reaction at the time of discharging the cooling water and the fly ash from the incombustible gasifier 200 is also partially dissolved in the cooling water or contained in the cooling water by the high pressure.

In addition, a level transmitter 160 is installed to keep the water level of the cooler 210 constant. By the operation of the valve 111 composed of the control valve operated by receiving the sensing signal of the level transmitter 160 And the water level of the bowl 210 is controlled to reach the predetermined water level or range.

In the step S12 of separating the fly ash, the fly ash collected in the cooling water is separated by the specific gravity difference and the centrifugal force using the hydrocyclone 120. In this process, the fly ash contained in the cooling water is removed, The hydrogen sulfide component dissolved or contained in the gaseous phase may be separated again as the pressure is lowered.

When the fly ash is separated from the cooling water, the hydrogen sulfide gas contained in the separated cooling water is separated from the fly ash (S13). For example, the cooling water and the hydrogen sulfide gas from which the flyashes have been removed pass through the gas separator 130 having the partition structure. In this process, the hydrogen sulfide component, which is an odor component, is completely separated into the gaseous phase, the cooling water exits through the circulation line 110 , And the hydrogen sulfide gas is transferred to the gas combustion unit 140 side.

After the separation of the hydrogen sulfide gas from the cooling water is completed, the hydrogen sulfide gas separated from the cooling water is combusted (S14). For example, hydrogen sulfide gas escapes by the blowing power of the blowing fan 142 through the gas transfer line 141 and burned in the flare stack 143.

When the hydrogen sulfide gas is separated from the cooling water, the cooling water is supplied to the non-fusing gasifier 200 again. That is, the cooling water discharged from the gas separator 130 flows into the storage tank 150 through the circulation line 110, and then the cooling water in the storage tank 150 is circulated through the circulation line 110, And the spray nozzle 170, the spray nozzle 210 is sprayed downward from above. Thus, the recirculation of the cooling water is continued by this method.

According to the apparatus and the method for treating fly ash and effluent of a non-frying gasifier according to the present invention, in the gasification reaction in the non-fossilized fractionation gasifier, the fly ash generated together with the synthesis gas is discharged It is possible to reduce the dust load in the dust collecting apparatus by collecting and discharging some heavier fly ash using cooling water of the striking apparatus. In addition, it is possible to recycle the hydrogen sulfide component gas discharged from the gasifier operating at high pressure condition into the liquid phase and the gaseous phase, and to return the cooling water to the gasifier without generating odor gas into the atmosphere.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

110: circulation line 111: valve
112: Pump 120: Hydrocyclone
130: gas separator 131:
132: partition wall 140: gas combustion section
141: gas transfer line 142: blowing fan
143: Flare stack 150: Storage tank
160: Level transmitter 170: Injection nozzle
200: Gasifier 210: Shooter
220: feed port 230: syngas outlet
240: Cooling water outlet 250: Inlet

Claims (9)

  1. A circulation line installed to re-supply the cooling water discharged from the impeller of the coarse gasifier where the ash is generated in the form of fly ash to the non-coherent gasifier, and a valve for opening and closing and a pump for transferring the cooling water are respectively installed;
    A hydrocyclone installed in the circulation line for separating the fly ash collected in the cooling water supplied from the combiner;
    A gas separator installed in the circulation line so as to be positioned at a rear end of the hydrocyclone and separating the hydrogen sulfide gas contained in the cooling water;
    A gas combustion unit for burning the hydrogen sulfide gas separated by the gas separator; And
    And a storage tank installed in the circulation line so as to be positioned at a rear end of the gas separator and storing the cooling water circulated through the circulation line.
  2. [3] The apparatus of claim 1, further comprising a level transmitter for measuring a level of the toucher and outputting the measured level as a sensing signal,
    Wherein the valve comprises:
    And a control valve that is operated by receiving a sensing signal output from the level transmitter.
  3. The gas separator according to claim 1,
    Wherein the partition walls are arranged in a zigzag manner on the inner side so as to switch the direction of the flow path through which the cooling water and the hydrogen sulfide gas pass.
  4. The gas burner according to claim 1 or 3,
    A gas transfer line installed to transfer hydrogen sulfide gas separated from the gas separator;
    A blowing fan installed in the gas transfer line; And
    And a flare stack for burning the hydrogen sulfide gas transferred through the gas transfer line.
  5. The apparatus according to claim 1, further comprising a spray nozzle installed to spray cooling water re-supplied through the circulation line from above the shooter.
  6. Separating the collected fly ash from the cooling water discharged from the tundish of the non-combustible gasifier where the ash is generated in the form of fly ash;
    Separating the hydrogen sulfide gas contained in the separated cooling water from the fly ash;
    Combusting a hydrogen sulfide gas separated from the cooling water; And
    And a step of re-supplying the cooling water from which the hydrogen sulfide gas has been separated to the non-fusing gasifier.
  7. The method of claim 6, further comprising the step of supplying oxygen to the non-fusing gasifier together with the pulverized coal before separating the fly ash, and causing the non-fusing gasifier to perform the gasification reaction at an operating condition of 1,000 to 1,200 ° C A method of treating fly ash and effluent of a non-combustible gasifier.
  8. 7. The method of claim 6, wherein separating the hydrogen sulfide gas comprises:
    A method for treating fly ash and effluent of a non-consolidated gasifier, wherein the direction of a flow path through which cooling water and hydrogen sulfide gas pass is changed by partition walls arranged in a staggered manner to separate hydrogen sulfide gas from cooling water.
  9. 7. The method of claim 6, wherein the step of re-
    The method of treating fly ash and effluent of a non-consolidated gasifier as claimed in any one of claims 1 to 5, wherein the fly ash is maintained at a predetermined level while cooling water is injected onto the top of the fly ash by the injection nozzle.
KR1020130051000A 2013-05-07 2013-05-07 Apparatus for treating fly ash and drain water of non-slagging gasifier and method thereof KR101436852B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000213371A (en) 1999-01-25 2000-08-02 Hitachi Ltd Gas turbine generating method and generating apparatus
KR20030067201A (en) * 2002-02-07 2003-08-14 사단법인 고등기술연구원 연구조합 Chiller of gasifier
JP2003262319A (en) 2002-03-05 2003-09-19 Jfe Steel Kk Gasification melting system and gasification melting method
KR20100125301A (en) * 2008-03-06 2010-11-30 우데 게엠베하 Method and device for treating fluid streams produced during combustion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000213371A (en) 1999-01-25 2000-08-02 Hitachi Ltd Gas turbine generating method and generating apparatus
KR20030067201A (en) * 2002-02-07 2003-08-14 사단법인 고등기술연구원 연구조합 Chiller of gasifier
JP2003262319A (en) 2002-03-05 2003-09-19 Jfe Steel Kk Gasification melting system and gasification melting method
KR20100125301A (en) * 2008-03-06 2010-11-30 우데 게엠베하 Method and device for treating fluid streams produced during combustion

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