KR101436066B1 - Tar separation apparatus integrated wet scrubber - Google Patents

Abstract

The present invention relates to a tar separator integrated with a wet scrubber, and more specifically, to a tar separator integrated with a wet scrubber, in which a cleaning water used to clean tar is not treated in an off-system waste water disposal apparatus but sequentially separates tar from the cleaning water in a closed wet scrubber, thus making it possible to minimize a land area required for installation by removing the waste water disposal apparatus, minimize an installation cost and operating expenses, collect all the tar generated from a thermal decomposition or gasification system, utilize the tar collected by specific gravity for various purposes such as fuel for a boiler or bio-coal, and facilitate installation even in a currently used wet scrubber. The tar separator integrated with a wet scrubber according to the present invention includes: a wet scrubber refining a synthetic gas generated from a thermal decomposition or gasification system; a water tank provided under the wet scrubber so as to collect the cleaning water discharged from the wet scrubber; a floating body provided to float on a water surface in the water tank; and a tar separator suctioning floating materials containing tar in the water tank together with the cleaning water and the synthetic gas through a hose connected to the floater, separating the floating materials from the cleaning water and the synthetic gas to discharge them to the outside, and circulating and supplying, to the water tank, the cleaning water and the synthetic gas from which the floating materials are separated.

Description

[0001] The present invention relates to a wet type scrubber,

The present invention relates to a wet scrubber-integrated tar separator, and more particularly to a wet scrubber-integrated tar separator in which, when a wet scrubber is used to purify tar in a synthesis gas obtained from a pyrolysis or gasification system, To a wet scrubber-integrated tar separator configured to be continuously recoverable by specific gravity.

Generally, the tar contained in the syngas obtained through pyrolysis or gasification is an impurity which must be removed for stable operation by causing closure and corrosion of piping, failure of the gas engine, and the like. The removal methods of tar include dry and wet type, and dry type devices include a condenser, an adsorption tower, a dry electrostatic precipitator, and a filter. The wet type devices include a scrubber and a wet electrostatic precipitator.

The tar removed by the adsorption tower, which is a dry type apparatus, is lost during the regeneration of the adsorbent or discarded together with the adsorbent, and the tar recovered by the condenser and the dry electrostatic precipitator are mixed with tar and water, and a separate separator is required. In addition, the conventional wet type apparatus discharges the scrubbing liquid of the wet scrubber out of the system and removes the impurities through a separate complicated wastewater treatment apparatus. In addition, when recovering tar with different boiling points, several scrubbers are required for each temperature, and an expensive auxiliary equipment such as decanter is required to separate the tar.

The technology relating to the conventional tar tablet will be described in more detail as follows.

1 is a configuration diagram showing a wastewater treatment apparatus for a tar tablet and a scrubber cleaning solution according to the prior art.

As shown in FIG. 1, the wastewater treatment apparatus 10 of the tar refining and scrubber cleaning liquid according to the prior art performs coagulation and sedimentation treatment on tar and rinse water, and the impeller (not shown) driven by the motor 11 A filtration filter 14 and an activated carbon adsorption tower 15 for filtering the sediment and the supernatant discharged from the coagulation sedimentation tank 13 and the filtration filter 14, And a circulation water tank 17 for storing the filtrate discharged from the activated carbon adsorption tower 15 and supplying it to the scrubber cooling tank as cleansing water by the pump 18. In the coagulating sedimentation tank 13, a flocculant for inducing agglomeration and precipitation of tar is introduced. The circulating water tank 17 is supplied with the washing water conveyed from the scrubber and the sediment under the circulating water tank 17 is supplied to the coagulating sedimentation tank 13 by the pump 18.

The wastewater treatment apparatus 10 of the conventional tar refining method and scrubber cleaning solution according to the prior art is characterized in that the coagulant is first added to the washing water pumped from the circulating water tank 17 and supplied to the coagulating sedimentation tank 13, After stirring, the mixture is allowed to stand to precipitate dust contained in the circulating water. After the precipitation, the supernatant is filtered with activated carbon in an activated carbon adsorption tower (15) to remove tar and the like, and then returned to the circulation water tank (17). The sediment of the flocculation tank 13 is filtered and discharged by the filtration filter 14. The purified water from which tar, dust and the like have been removed is stored in the circulation water tank 17 and supplied to the scrubber by the pump 18.

However, in the conventional wastewater treatment apparatus 10 of the tar refining and scrubber cleaning solution, it is difficult to recover the total amount of removed tar, and a lot of additional facilities are required for separation and collection of tar, and installation and operation costs are high .

As a conventional technique for separating and recovering tar, there is a recovery method of coal-quick thermal decomposition tar of Japanese Patent Laid-Open Publication No. 2000-129269, which is a multi-stage cooling system in which tar is cooled and condensed step by step, A plurality of stages of cooling devices for separating and recovering the tar cooled and condensed for each cooling device and cooling and condensing the tar in the gas, and a separate recovery device such as a decanter for each cooling device.

However, the conventional method for recovering coal-tar thermal cracking tar has a problem that a scrubber is installed in multiple stages in order to remove tar by boiling point, and an expensive facility such as decanter is required for each scrubber in order to recover tar.

As a conventional technique for separating and recovering tar, there is a biomass gasifier having a residual water recovery structure using a water chamber of Korean Patent Laid-Open No. 10-2012-0075664, which combusts and pyrolyzes biomass to gasify A heat exchanger for separating residues such as tar, moisture, and foreign substances by lowering the temperature of the syngas of high temperature generated in the gasifier by heat exchange; a scrubber for separating and removing fine residues in the heat- And a discharge pipe formed at a lower end of each of the chambers constituting the gasifier, the heat exchanger and the scrubber to discharge residues such as building materials, tar, moisture, etc., and is operated at a pressure lower than atmospheric pressure, The lower part of the discharge pipe is provided with a water chamber, which is a water tank in which water is stored. So that external air is prevented from flowing into the chamber through the discharge pipe.

Such a conventional biomass gasifier having a residue collecting structure using a water chamber has a main purpose of preventing water from entering the air by intercepting the outside air with water and dust and tar of the discharge tube float on the water surface, It is not well precipitated in the water tank, and since some precipitated dust and tar continue to circulate through the pump, it is concentrated without being recovered from the system. In addition, since the water chamber is open type, there is a problem that the working environment is poor and the aesthetic appearance is deteriorated by the odor caused by tar.

Japanese Patent Laid-Open No. 2000-129269

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 provide an apparatus and a method for minimizing a site area for installation, minimizing an installation cost and an operation cost by omitting a separate wastewater treatment apparatus, To recover the entire amount.

According to an aspect of the present invention, there is provided a wet scrubber for purifying a syngas produced from a pyrolysis or gasification system. A water tank provided below the wet scrubber to collect washing water discharged from the wet scrubber; A float provided so as to float on the water surface in the water tank; And a float including tar floated in the water tank through a hose connected to the float fluid is sucked together with the cleansing water and the syngas to separate the float from the cleansing water and the syngas and discharge the float to the outside, And a tar separator circulating and supplying the water and the syngas to the water tank.

The water tank may be provided with a first drain valve at a lower portion thereof so that the sediment including tar is discharged to the outside along an inclined surface formed on the bottom surface.

The water tank may be provided with a second drain valve between the bottom surface and the water surface so that the water soluble tar is discharged to the outside.

The tar separator includes a pump installed in the hose; Wherein the water is supplied from the float, the washing water, and the syngas supplied through the hose to the outside by the overflow, and the partition wall for allowing the cleansing water and the synthesis gas to pass therethrough while blocking the movement of the float, Rizzo; And a circulation tank for circulating and supplying the washing water and the syngas separated from the floating material to the water tank in the water separation tank.

The partition wall may have a first passage portion formed at a lower portion thereof to allow the washing water to pass therethrough and a second passage portion formed at an upper side of the first passage portion to allow the syngas to pass therethrough.

The circulation tank may include a hollow tube vertically installed in a region where the washing water and the synthesis gas flow in the water tank.

According to another aspect of the present invention, there is provided a water scrubber comprising: a water tank for collecting washing water of a wet scrubber; A float provided so as to float on the water surface in the water tank; And a tar separator connected to the float by a hose, wherein the tar separator sucks suspended matter including tar floating in the water tank through the hose together with the cleansing water and the syngas, There is provided a wet scrubber-integrated tar separating apparatus for separating and discharging floating matters and circulating and supplying cleansing water and syngas separated from suspended matters to the water tank.

According to the present invention, the cleaning water used for cleaning the tar can be continuously separated from the washing water in the closed wet scrubber without being treated in the wastewater treatment system outside the system, It is possible to minimize the site area required, minimize installation and operation costs, and recover the entire amount of tar generated from the pyrolysis or gasification system. The tar recovered by weight can be used for various applications such as boiler fuel, And it is easy to install in existing wet scrubber.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a wastewater treatment apparatus for a tar tablet and a scrubber cleaning solution according to a conventional technique. FIG.
FIG. 2 is a schematic view showing a wet scrubber-integrated tar separating apparatus according to an embodiment of the present invention; FIG.
3 is a detailed view of a tar separator of a wet scrubber integrated tar separator according to an 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.

2 is a cross-sectional view illustrating a wet scrubber-integrated tar separator according to an embodiment of the present invention.

2, the wet scrubber-integrated tar separator 100 according to an embodiment of the present invention includes a wet scrubber 110, a water tank 120 into which the washing water of the wet scrubber 110 flows, a water tank 120 And a tar separator 140 connected by a hose 141 to the float 130 and the float 130 which float on the surface of the water in the tank.

The wet scrubber 110 is adapted to purify the syngas produced from the pyrolysis or gasification system by a wet process, for example, a venturi scrubber (not shown) provided with a venturi tube to remove particles such as dust from the syngas, A second spray scrubber (not shown) for spraying the cleaning water to the syngas, and a second spray scrubber (not shown) for spraying the syngas secondarily, and a gas-liquid separator A separation cyclone (not shown), and a reservoir (not shown) in which the washing water is circulated and supplied by a pump.

The water tank 120 is provided at the lower portion of the wet scrubber 110 to collect the cleansing water after completing the wet process from the wet scrubber 110. Further, the water tank 120 can collect not only the gas-liquid separation cyclone but also all the washing water sprayed or separated from the wet scrubber 110, and the tar and the dust together with the washing water are collected together.

The water tank 120 may be provided with a first drain valve 122 at a lower portion thereof so that sediments including tar are discharged to the outside along the inclined surface 121 formed on the bottom surface, 121 and the water surface. Here, the inclined surface 121 may have an inclination of 5 to 10 degrees. The first and second drain valves 122 and 123 may be control valves as well as manual valves for automation.

The float 130 may be a floating skimmer or a buoyant material or a hollow member which is installed to float on the surface of the water in the water tank 120 and may be a floating skimmer as in the present embodiment.

The tar separator 140 sucks suspended matter including tar floating in the water tank together with the washing water and the syngas through the hose 141 connected to the float 130 and separates the suspended matter from the washing water and the syngas, And circulates and supplies the cleansing water and the syngas separated from the suspended matters to the water tank 120. [

3, the tar separator 140 includes a pump 142 installed in the hose 141, a float 142 supplied from the scum, clean water, and syngas supplied through the hose 141 by the pump 142, A water separator tank 143 for discharging water to the outside by overflow and providing a partition wall 143a for allowing the washing water and the syngas to pass therethrough while blocking the movement of the float, And a circulation tank 144 for circulating and supplying the cleansing water and the syngas separated from the water tank 120 to the water tank 120.

The hose 141 is positioned close to the water surface of the water tub 120 and the height can be adjusted by a height adjusting device (not shown) so as to adjust the installation height as required.

The pump 142 sucks the scum and syngas together with the suspended solids through the hose 141 when sucking suspended solids including tar and dust through the hose 141.

The water separator tank 143 has first and second spaces 143b and 143c that are divided on both sides by the partition wall 143a and a float containing tar and dust is introduced into the first space 143b through a tar reservoir And the second space 143c may be provided with a partition wall 143a to prevent the ingress of the suspended matter. In this case, the partition wall 143a may be provided with an opening at one side of the tar separator 14 So that the washing water and the syngas are introduced. In addition, the suspended solids separated from the water separation tank 143 may be discharged at a constant rate out of the system through a tar reservoir (not shown). The tar and dust of the suspended solids discharged from the tar reservoir may be stored in separate containers . On the other hand, in order to smooth the discharge of the separated tar, the tar reservoir or the pipe can be maintained at a predetermined temperature due to the heat supplied from the hot wire.

A first passage portion 143d may be formed in the lower portion of the partition wall 143a to allow the washing water to pass therethrough and a second passage portion 143e may be formed on the upper portion of the first passage portion 143d . The first passage 143d may be a gap formed between the lower end of the partition 143a and the bottom of the water separation tank 143 or may be formed at a lower portion of the partition 143a. The second passage portion 143e may be a gap formed between the upper end of the partition 143a and the upper surface of the water separation tank 143 or may be a hole formed on the upper portion of the partition 143a .

The circulation tank 144 may include a hollow tube vertically installed in a region where the washing water and the syngas flow in the water tank 120 and may be cleaned by the water tank 120 through a supply pipe 144a Water and syngas are supplied, and a pump for pumping cleaning water and syngas may be installed if necessary.

The operation of the wet type scrubber-integrated tar separator according to one embodiment of the present invention having such a structure will be described below.

The tar removed by the wet scrubber 110 is present in the water tank 120 largely of lightweight pseudo-tar, heavier sedimentable tar, and water-soluble tar mixed with cleansing water. Conventionally, since the floating tar is always floating on the water surface of the water tank 120, it can not be discharged to the outside of the system during operation, and is only removed through the manhole when the operation is stopped. In the thermal decomposition or gasification system, , The recycle structure of syngas and the pressure balance in the tar separator during the recovery of suspended tars are the main design factors.

The hose 141 connected to the pump 142 is inserted into the water tank 120 and the hose 141 is connected to the float 130 so that the water can be discharged continuously during the operation, The float tar can be pumped regardless of the change in the water level in the water tank 120. [ In addition, by pumping the pump 142, the washing water and the syngas together with the floating tar are sucked together and sent to the tar separator 140 to be separated into tar, washing water, and syngas. Tar and cleansing water are separated from each other in the water separator tank 143. The overflow tar is discharged out of the tar separator 140 and the cleansing water is supplied to the first passage portion 143d of the partition 143a, And is again supplied into the water tub 120 by the circulation bath 144. [ The syngas passes through the second passage portion 143e of the partition wall 143a and is supplied into the water tub 120 together with the washing water by the circulation tank 144 so as to prevent the inflow of the outside air and the leakage of the synthesis gas do.

The sedimentable tar having a heavy specific gravity in the water tank 120 is discharged to the outside of the system through the first drain valve 122 installed on the bottom side and the water soluble tar is discharged from the second drain valve 123 in the middle of the water tank 120 And discharged through the system.

The bubble oil recovered by the tar separator 140 has a high calorific value and a high viscosity so that it can be used in the production of a solid fuel with a high heating amount mixed with the production of a bio-call and the first drain valve 122 The recoverable tar recovered from the second drain valve 123 of the water tank 120 can be used as a chemical raw material through a distillation process. The recovered washing water can also be supplied to be reused as the washing water of the wet scrubber 110.

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: Wet scrubber 120: Water tank
121: inclined surface 122: first drain valve
123: second drain valve 130: float
140: tar separator 141: hose
142: Pump 143:
143a: partition wall 143b: first space
143c: second space 143d: first passage portion
143e: second passage portion 144: circulation tank
144a: Supply pipe

Claims (7)

A wet scrubber for purifying syngas produced from a pyrolysis or gasification system;
A water tank provided below the wet scrubber to collect washing water discharged from the wet scrubber;
A float provided so as to float on the water surface in the water tank; And
A float containing tar floated in the water tank is sucked together with the washing water and the syngas through the hose connected to the float, the float is separated from the washing water and the syngas and is discharged to the outside, And a tar separator circulating and supplying the syngas to the water tank,
The tar separator comprises:
A pump installed in the hose;
Wherein the water is supplied from the float, the washing water, and the syngas supplied through the hose to the outside by the overflow, and the partition wall for allowing the cleansing water and the synthesis gas to pass therethrough while blocking the movement of the float, Rizzo; And
And a circulation tank for circulating the washing water and the syngas separated from the suspended matter in the water separation tank to the water tank. The method according to claim 1,
Wherein the water tank is provided with a first drain valve at a lower portion thereof so that the sediment including tar is discharged to the outside along an inclined surface formed on the bottom surface. 3. The method according to claim 1 or 2,
Wherein the water tank is provided with a second drain valve between the bottom surface and the water surface so that the water soluble tar is discharged to the outside. delete The method according to claim 1,
Wherein the partition wall has a first passage portion formed at a lower portion thereof to allow the washing water to pass therethrough and a second passage portion formed at an upper side of the first passage portion to allow the synthesis gas to pass therethrough. The method according to claim 1,
Wherein the circulation tank includes a hollow tube vertically installed in a region where the washing water and the synthesis gas flow in the water tank.
delete

Images