SA110310718B1 - Foam Removal Apparatus - Google Patents

Abstract

The present invention relates to a defoaming device (1) installed in a drainage channel (10), through which seawater discharge used in power plants flows. The foam recovery part (2) recovers the foam (b) floating on the water surface (Water Surface WL) from the seawater drainage flowing through the drainage channel (10). The foam (b) recovered by the foam recovery part (2) flows into the foam recovery tank (3). The defoaming part (4) removes the foam flowing into the foam recovery tank (3). A release portion (6) returns the acquired foam component by defoaming (b) to the defoaming portion (4) and discharges the seawater effluent into the froth recovery tank (3) together with the froth from the froth recovery tank (3) to the vicinity of the drain channel (10) .

Description

Y — M AY Foam removal apparatus Full Description BACKGROUND The present invention relates to the treatment of sea waste water in flue gas desulfurization systems used in coal fired; burning crude oil” and heavy oil power stations; And for more specification; 43.8 © Relates to a foaming device that removes foam from wastewater discharged from seawater desulphurization systems. traditionally Considering coal-fired power plants; crude oil; and what looks like fuel; The vacuumed combustion exhaust gas from the boiler (as it will be called hereafter as 'exhaust gas' (ES) is released to the atmosphere(s) after removal of sulfur oxide; Jie sulfur dioxide; present in the exhaust gas of the 0 boiler. Examples include For well-known desulfurization processes using flare gas desulfurization systems that perform desulfurization treatment (limestone gypsum processes, spray dried processes, and Jue seawater gas processes. Among the above, fgas desulfurization systems adopt ( Hereinafter called “Water Desulfurization Systems” (ol) Seawater scrubbing processes using seawater as absorbent (absorbent). ally V0 in these processes; by supplying seawater and boiler exhaust gas to a tubular desulfurization tower Cylindrical (absorption tower) Vertical Lise A gas-fluid contact is achieved with a wet base; sea water acts as an absorbent and removes sulfur oxide. The sea water is disposed of after desulfurization, and used as an absorbent in the desulfurization tower described above and from the seawater used to cool the power station (seawater drainage) to the ocean; and Yo mixes the surplus seawater (effluent) from the seawater desulfurization system with seawater

new. The (decarboxylated) group is removed from the seawater drainage through aeration (mixing air with gas), where fine aeration bubbles are released from ventilation nozzles located in the surface of the bottom of the drainage channel; during the flow from the drainage channel and drain from it. The area in which it takes place is called This aeration, in which fine aeration bubbles are released into a channel

© exchange; Where the carboxyl group is removed to drain the sea water it is called the aeration zone. When you adjust the pH value (the scientific standard for acidity or alkalinity) and the dissolved oxygen value (Dissolved OxygenDO) of the seawater drain by performing the decarboxylation process described above; Foam is generated on the surface of the seawater wastewater flowing through the drainage channel as a result of the interaction between fine aeration bubbles and foam components; such as organic matter;

0 in sea water. This Bell is released as seawater drains from the drainage channel into the surrounding ocean area; And it is difficult to remove its foam. Thus a problem arises in that the foam flowing into the ocean is scenically undesirable. add to that; There is a problem that a flare gas desulfurization system that does not adopt seawater scouring processes can also suffer from a foaming problem; Depending on the properties of sea water

Yo and the like. In order to solve the problem described above; A technique has been proposed to remove foam from seawater drainage flowing through the drainage channel (see for example in the patent text 1 which is the text of the untested Japanese sample application; Publication No. 5-17 HTI) 0 by removing the slurry from Drainage of sea water as described here. The landscape problem caused by foam is solved. a

Yo however; Methods for removing foam include seawater dewatering; Such as the techniques described in the patent application

| 1 on a problem; It is that getting rid of the foam components present in the removed foam is difficult. For example; Consideration can be given to the method of disposal in which the foam components are separated from the foam by converting them into powder form or slurry ide form, and they are disposed of as waste in the ground.

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waste in the power plant. however; The foam components also differ depending on the fuel (combustion 00505180”) in the boiler; There is a problem that the foam components cannot be easily separated from the foam because the methods of separating the foam components from the foam such as separation using an end filter or separation using centrifugal force (5:66?) centrifugal have not been established yet.

© The present invention is designed to solve the problems described above; One of his goals is to obtain an AY foaming device that can remove foam from the surface of sea water in the drainage channel and can easily process the foam components. General description of the invention in pursuit of the objective described above; The invention provides the following solutions:

001 of the present invention is a device for de-foaming a Cafe in a drainage channel through which the waste water (ad) used in a power plant branches out. The eda defoamer includes a foam recovery that recovers floating foam from a seawater discharge flowing through a drainage channel ‘a foam recovery tank into which the recovered foam is flowed by means of a foam recovery portion’ a removal part in which the foam overflowing into a foam recovery tank is removed; and a release fraction that restores the foam components acquired by removing the foam by means of a removal fraction

Yo The foam and sea water discharge flowing into the foam recovery tank together with the foam from the foam recovery tank to the nearby drainage channel. According to the present invention » the foam recovered from the foam recovery tank is defoamed from the water surface to drain the seawater effluent through the drainage channel by means of the defoaming part; The foam component returns to the pall from the drainage channel together with the sea water discharge into the foam recovery tank. however

0 in comparison to the method in which the foam components are separated in powder form or slurry form from vacuum seawater; It can handle foam ingredients easily.

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Since the main component of the foam components is originally an organic substance contained in sea water, even if the foam components return to the drainage channel, the discharge of sea water flowing through the drainage channel does not violate environmental standards. Considering the invention described above; It is preferable to own a foam recovery tank

© (an agitating motor) that agitates the seawater drainage flowing from it together with the foam. According to the present invention, since the seawater drainage flowing into the foam recovery tank is agitated, the foam component does not settle in the foam recovery tank. Meaning AT, then The foam component is less likely to be deposited on the bottom of the foam recovery tank, because the foam component agitated by the stirring part returns in the form of slurry water to the drainage channel by the release part.

0 Generally if the seawater discharged into the froth recovery tank is not agitated the residual foam component will reduce the usable space in the froth recovery tank; Which requires a process to remove the precipitated foam component. in contrast ; if no foam component is deposited on the bottom of the foam recovery tank of the Tada defoamer of the present invention; No process is required to remove the residual foam component, the need to repeat such process is reduced.

Vo According to the defoamer of the present invention “the foam recovered in the foam recovery tank is removed from the surface of the water to drain the seawater flowing through the drainage channel”; The aie foam component is due to the proximity of the drainage channel together with the seawater discharge into the sludge recovery tank. Therefore, the device offers the advantage of removing foam from the surface of sea water in the drainage channel, in addition to the ease of treating the foam component.

C pa 0 3 abbreviation A diagram of Fig. 1 is a horizontal view describing the arrangement of a defoamer according to one of the contents of the present invention. Figure Y is a brief schematic representation of the defoamer arrangement in Figure 1

appearance ? It is a schematic presentation to explain the arrangement of eda recovery foam in Fig. 1. Figure; is a section to explain the arrangement of the guide part in Fig. 9. Fig. © schematic view to explain the arrangement of the foam recovery tank » defoaming part; and the stirring part in Fig. 1©. Detailed description: The defoaming device will be explained according to one of the contents of the present invention with reference to the figures (—0. Figure 1 is a horizontal view to explain the defoamer arrangements according to this content. the shape ? A schematic representation to briefly explain the defoamer arrangement in Fig. 1.

0 Defoamer 1 operates in accordance with this content to separate; Removal; and treatment of foam (B) floating on (water surface WL (water surface) draining desulfurized sea water from system A) vulcanization of the flare gas; which uses sea water, for example, as an absorbent and treatment of foam B floating on the surface of the water WL of seawater drainage flow through drainage channel AN as shown in Figure oY includes seawater drainage device 1 mainly includes part

¥ restore foam; Foam recovery tank? » defoaming part; ; move part©; And a part is released as shown in Fig. 0) Drainage channel 01 is a flow path surrounded by walls 11 liberated from LDA Sea water discharge from the flare gas desulfurization system to Jamal Drainage channel 01 includes VY aeration zones 71b and 71c in which the carboxylate group is removed from seawater

Yo the outgoing. NY Ventilation Zones 71b and 71c can have known arrangements and can be particularly unlimited.

Figure 1 is a schematic representation to explain the arrangement of the foam recovery part of Figure 1. As shown in Figures oF - 1 does the foam recovery? by recovery of foam B floating on the surface of the water (WL) from seawater drainage from the drainage channel .01 includes oa recovery of foam Y mainly eda manual 17; confinement part VY trolley YY 5 and V¢ 0 guide plate; is a passage to explain the arrangement of the guide part in FUSE The guide part YY acts as rails through which the small cart gia YY supports the foam confinement XY as shown in fig. and 6; The guide part 71 has a pair of 1 7 semi-girder members or 1 "b small trolley rails.

0 the pair of semi-beam members (IY) extend so as to cut through the drainage channel 01 and the upper end of the walls 11 are hardened in the drainage channel 01. the semi-beam members ?1a are made of cement and extend parallel to each other some. The trolley rails shall be 1" b dag-shaped members (made of metal; Jie Stainless Steel SUS) and fixed to the upper surface of the semi-members.

Vo crossbar IVY the mini-carriage YY is fixed on the rails of the mini-carriage 1 "b and a toothed device 7b is installed under the mini-cart to collect the foam and slide on the guide plate AE on the other hand; the foam retaining part is fixed YY on the surface of the bottom of the semi-girder member 1?a of the guide part YY fixed below the seawater discharge flow path (at the bottom of Fig. shape (Y

.¥ in the direction of the foam recovery tank Yo a pall of channel 71 channel 11 and walls 71 between the pair of guide parts VE and guide plate VY angi slot on the other hand; 01 Exchange

A —_ orifice VY is the part through which foam B flows through drain channel 01 into the foam recovery tank * and where the wall height 11 is lower compared to the other parts. plate 16 Jal) is located in hole AY The guide plate 1 £ separates the foam with the sea water drain when the foam B flows through the drainage channel © 01 to the foam recovery tank LY advances in addition; The guide plate 16 is an inclined wall at the opening VY and creates an inclined surface ef from the drain channel 01 to the foam recovery tank ?. The guide plate 16 shall be fixed so that its upper end is located at a level higher than the highest water level (for example, the highest tidal level) of the seawater drainage flowing through the channel Ae a pall 0 The foam retention part YY is a of a film- or plate-shaped member that catches foam B flowing downward together with the seawater discharge into drainage channel 01 at a place below the frequency zone of the small cart YY thus; the lower part of the foam trap YY extends at least To the surface of the water from the sea water drain flowing through the drain channel Ne (Sey) Using a known installation “(curtain wally) Jie 0 A foam gathering float A tool for collecting oil floating on the water as part YY foam trapping The small trolley reverberates on the guide parts YY to recover the foam caught by the foam catching part 77 to the JY foam recovery tank The YY small trolley mainly includes the YY trolley body and the CVF toothed tool 0 The body of the cart 7?a holds the toothed device “b” and resonates on the rails of the cart 1b of the guide part YY by means of wheels fitted on the body of the cart ??a. The body of the cart ‘?a moves using a known structure to generate motive force; Jie the motor.

Toothed device “B” resonates with the body of the small cart WF to recover the foam B flowing through the drainage channel 01 to the foam recovery tank LY The toothed device YY is formed in the form of a film or in the form of a plate and is fixed so that its upper part is connected to the body The small cart YY the lower gal of which at least reaches the foam b flowing through the drainage channel .01© In addition to cll the toothed device “b is formed to collect the foam b when it moves towards the hole 0 and does not collect FOAM B WHEN IT MOVES BACK FROM Slot AY FOR EXTREME DEFINITION THREAD TY IS FORMED TO BEND IN TWO TOWARDS SHOLE 11 AT A NEAR CENTER IN THE VERTICAL DIRECTION WHEN THREAD 77B MOVES TO Slot OF It extends in a straight line; the lower end of the notched tool "B" collects the foam B. On the 0 side (gal) when moving backwards from the hole OF, the lower end of the toothed tool “B” cannot collect the foam en because the toothed YY flexes towards the hole 17 in a position near center. Unmarked. Figure © is a schematic view to explain the arrangement of the foam recovery tank » defoaming part; agitating part in Fig. ?. The recovered foam b flows into the foam recovery tank oF where it is skimmed from the recovered foam b. As shown in Figure 1 and Fig. 0 the foam recovery tank mainly includes a first zone 91 which removes 0 foam and a second zone 7 ?removes and agitates the foam.The first zone 71 is a zone where the initially flowing B foam is recovered by means of ea foam recovery YX

Ye - - The first region, YY, is located in a region adjacent to the drainage channel 01 and also adjacent to the hole VY as well; The first zone 1 is set up so that it occupies a smaller area and has less depth than the second zone ang YY Defoaming spray nozzles 41 of the defoaming part; In the first region, FY, the second region, YY, is an area into which foam B flows, and sea water flows into the first region © FY. It is also an area in which the foam components are removed from the foam B in the first region.

71 And foam B, which had not yet foamed, poured into it. The second region is arranged adjacent to the first region FY such that the slot VY is the first region of) and the second region 77 respectively. 1 special defoaming spray nozzle is installed for sya defoaming; and the animate part © in the region All).

Yaga ll Defoaming part 4 removes foam B recovered in recovery tank 0 41 foam in base Defoaming spray nozzle A) As shown in the figures ? 05 Includes part and defoamer spray pumps. B Spray sea water drain on foam b from top to remove foam from 41 All) Spray Nozzles Supply seawater to the defoamer spray nozzles. 41 foam b. Provides defoaming spray pumps

0 defoaming spray nozzles 41 above the first zone 1 ? The second zone VY in the froth recovery tank XY can be defoamer spray nozzles 41 have a known arrangement and are not particularly limited 0 Defoamer spray pumps 47 defoamer spray nozzles 1; supply sea water taken from channel

0 Exchange. 01 Considering this content; An example of two defoaming spray pumps 47 will be explained. This arrangement enables a spray pump to remove one foam 7; It supplies sea water to the defoamer spray nozzle 41 and another defoamer spray pump £Y is back up.

1 1__— SY that the number of active defoamer spray pumps ? can be changed depending on the change in the amount of foam b to be removed ¢ This | is not particularly limited. There are 7 £7 defoamer flow rate valves so that fully open or fully closed; at the inlets (top side) of the defoamer spray pumps 7; there are Jane © flow-rate defoamer valves (fF) which control the flow rate of the seawater discharge flowing into or Outside the pumps at the outlets (bottom side) of the defoamer spray pumps LY The agitation part © prevents the foam components in the foam B from settling on the bottom of the Nagel recovery tank The agitation gia © is located in the second zone VY of the foam recovery tank Considering this implication” 0 an example of six driving parts 0 will be explained as shown in oY Ja includes driving part 5 in | based on rotor 1 © and driving motor oY rotor 01 operates on Agitation of seawater drainage in the second zone "79 of the foam recovery tank * from Jal Prevents foam components from sedimentation. Yo The rotor includes 1© rod-shaped shaft and an ios member perpendicular to the shaft. The shaft of the rotor is connected ©1 with the drive motor OFF so that the rotational forces can be controlled. The drive shaft and member of the rotor ©1 are driven rotationally by the drive motor OF The rotary motors OF rotates the rotor ©1 rotated. Considering this content; An example of the rotor (©1) and drive motor (OF) placed one to one is shown. 0 The number of moving parts #1 to the number of moving motors oF can be in the ratio of one to candy one to number; And the number to one and be unlimited in particular.

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The release portion >" returns the foam components of the foam B from the foam recovery tank? to the drain channel .01

As shown in Figure oY the release part 1 mainly includes the release flow path “1” and (

17 (scum slurry pumps (ph) exchange

The +1 release flow path connects the second zone YY of the foam recovery tank ¥ to the proximal zone

© From the drainage channel

The slurry drainage pumps + re-discharge the seawater and foam components into the second zone vy

For foam recovery tank? to drain channel 01 through release flow path 1. Considering this

Content ¢ An example of a JY slurry drainage pump will be explained This arrangement enables a pump

Mud drainage “> from re-discharging the sea sc and foam components to 01 a pall sad and another 0 77 mud drain pump to work as backup.

SY indicates that the number of active 7” slurry drainage pumps can change according to the change in the amount of water discharge

The sea and foam components returned to the drainage channel Rs Vo are not specifically specified.

Fully open or fully closed TF valves are located at the inlets (side

upper) AY slurry drainage pumps and release flow rate valves ?1; which control the rate of VO flow of sea sewage flowing into or out of the pumps; at exits (lower side)

after that; Referring to Figures 1-0, the process of the defoamer 1 arrangement will be described

described above.

For example; Drainage seawater from the flare gas desulfurization system flows into channel 0 drain 01 and undergoes decarboxylation in vent zones NY, 11b and VY

As shown in Figure A, the seawater drainage after the decarboxylation process generates

Foam B on the surface of the water (WL) Foam B flows downward (lower side of Figure 1) with

Drainage of sea water.

- 1 - As shown in the figure? Figure “B-Foam flowing downward is trapped by a foam retainer YF below gia FOAM RECOVERY 7. Captured foam is recovered in the foam recovery tank? By means of the small cart VY oscillating along the guide part transversely on the drainage channel Ne © for further determination; While the cart body YY moves along the guide part YY towards the foam recovery tank? ; The 77 toothed device extends down from the body of the IVY mini cart collecting the foam trapped in the foam recovery tank. When the toothed 77b reaches the inclined wall VE at the hole OY, the lower end of the Go Faia is lifted up along the inclined wall VE with the movement of the body of the small cart (YY 7? A. At this time » Although foam B is held by the notched tool 0

Ne Bl and between the wall VY the seawater drain flows downward through an opening between the toothed device This means that foam b separates from the seawater drainage. When the toothed tool 7b crosses the end of the inclined wall in the foam recovery tank; The foam B.0 retained by the toothed tool “B” falls into the foam recovery tank Yo When the small cart reaches the ends of the YY guides in the foam recovery tank oF it reverses the direction of travel and starts moving Tam from the tank Foam recovery. at this time; Toothed device “B” is curved so that it can easily cross over the sloped wall; The foam B falling into the foam recovery tank is initially directed to the first zone Y.

FY and then to the second area above foam B to remove foam B; 41 Seawater drainage is sprayed from the defoaming spray nozzles

FY and the second region 1 in the first region

— ¢ \ _ Drainage of seawater sprayed from a 511 Be ll removal spray nozzle from the Yo a pall canal is provided by defoamer spray pumps 7;. Considering this content; An example of one of two defoamer spray pumps 7 will be described; In this case; The defoamer flow rate valves 47 installed on the upper side and the lower side of the working defoamer spray pumps 7 shall be; open and are defoamer flow rate © valves?; installed on the upper side and lower side of the defoaming spray pump working pall 7; closed. Subsequently; Seawater drainage is supplied to the defoamer spray nozzles 1; through open froth rate All) valves £F and a working defoamer spray pump 67 . mention that; In Figure oF open £1 defoamer flow rate valves are shown as schematic symbols; 0 indicates defoamer flow rate 7 valves; enclosed as filled icons. Foam B contains foam components such as organic materials contained in sea water, and the foam components are mixed with sea water drainage in the foam recovery tank? When you defoamer b. due to the agitation of the seawater drainage by the agitation part 0 in the second region 1; The foam components also move with the drainage of sea water. Yo This means that the moving motor, oY, supplied with electricity, generates rotational operating forces and operates the rotating parts 01 rotationally. Laie Rotors ©1 operates rotationally; The moving members located at the lower ends of the shaft rotate to drain the sea water. This creates a flowing circulation in the vertical direction, for example, in the seawater drainage in the second region (FY), causing the foam components that have a specific gravity greater than the seawater drainage to be uniformly distributed in the seawater drainage. Yo The seawater discharge in the second area YY with the foam components contained there returns to the area near Qa 2 drainage channel 01 through the path of the release flow IR! and the slurry drainage pumps 17> in the ea release 6.

_ m \ _ in view of this content; An example of one of the SY slurry drainage pumps will illustrate this case; The atl (TY) flow rate valves installed at the top side and bottom side of the working TY slurry drainage pump are open; The release flow rate valves 17 installed on the upper and lower sides of non-operating slurry drainage pumps 7 are closed. o Hence, the seawater drainage is supplied to the sludge removal spray nozzles q through open release flow rate 7 valves and a working slurry drainage pump 11. mention that; In Figure oY the open RFL 17 valves are shown as schematic symbols and closed RFL 1 valves are shown as filled symbols. SY that the slurry discharge pumps TY and the release flow rate valves 17 are controlled on the basis of the measured value received using a TE level sensor installed in the foam recovery tank? To measure the seawater drainage water level. 7 defoaming spray pumps can also be controlled; slurry discharge pumps TY defoamer flow rate valves “;; and release flow rate valves 6 can be based on the measured value received using the level sensor 14 installed in the foam recovery tank? to measure the level of the yo waste water over the sea 64 and this 1 Particularly unlimited. Considering the arrangement described above, the recovered foam b foam is removed from the water surface from the seawater discharge flowing through drainage channel 01 to the foam recovery tank ?by means of the CAR part of the foam p and the foam components to jal) from the Yo i pall channel with seawater discharge into the LY foam recovery tank thus; compared to the method in which the foam components are in the form of powder or in the form of slurry and are separated from the seawater discharge, the components of The foam can be easily processed Cal mentions that the main component of the foam is organic materials originally contained in the sea water, even if the foam components return to the Vo a pall channel, the discharge of the sea water flowing through the drainage channel 01 does not Violates environmental standards.

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Due to the sea water flowing into the foam recovery tank? It is moved by the Move © part

The foam components do not settle in the foam recovery tank.” In the sense of AT given that components

The foam aroused by the stirred part © returns together with the seawater discharge to the drainage channel 01

via emancipation part 6; The foam components are less likely to settle on the bottom of the oo foam recovery tank.1

Loses If the seawater discharge into the foam recovery tank? is immobile; the foam components

The deposits reduce the usable space of the oF foam recovery tank necessitating an operation to remove components

precipitated foam. In contrast; Since the foam components are not deposited on the bottom of the foam recovery tank 0

in foam recovery apparatus 1 according to this inclusion; The need for Jia or repetition of this process is reduced.

Claims (1)

Cy Claims 1-1 A foaming device installed in a discharge channel through which seawater used in power plants flows and is discharged; The defoamer includes: y a foam recovery part which recovers the foam together with the drained sea water; The foam floats on the surface of the drained seawater flowing through the drainage channel; 1st zone of froth recovery tank ° into which foam and drained seawater flow back by defoaming part (A ein deel) defoams foam in first zone of froth recovery tank using drained seawater; second zone of Foam recovery tank into which the discharge of seawater A flows and the foam component acquired by removing foam by means of Al) ein the foam flowing from 9 the first zone of the foam recovery tank; edn is released ashy by returning the foam components and draining the water of 0 - The sea from the second zone of the slurry recovery tank to the drainage channel Cua 11 The second zone of the slurry recovery tank has an agitating part that agitates the drained sea water flowing there together with the slurry component. \ "- foam defoamer according to item Cuno) The first zone of the recovery tank Y has a depth less than the depth of the second zone of the foam recovery tank. —F \ foam defoamer according to the item 1 or 7, whereby the amount of seawater, Y, discharged back is controlled by the release zone on the basis of the measured value of a level sensor installed in the foam recovery tank v.