WO2022113924A1 - Desulfurizing device - Google Patents

Desulfurizing device Download PDF

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Publication number
WO2022113924A1
WO2022113924A1 PCT/JP2021/042739 JP2021042739W WO2022113924A1 WO 2022113924 A1 WO2022113924 A1 WO 2022113924A1 JP 2021042739 W JP2021042739 W JP 2021042739W WO 2022113924 A1 WO2022113924 A1 WO 2022113924A1
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WO
WIPO (PCT)
Prior art keywords
flow path
desulfurization apparatus
exhaust gas
cleaning liquid
cleaning
Prior art date
Application number
PCT/JP2021/042739
Other languages
French (fr)
Japanese (ja)
Inventor
善規 田口
裕樹 成田
潤 島村
圭吾 内山
Original Assignee
三菱重工業株式会社
三菱パワー株式会社
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Application filed by 三菱重工業株式会社, 三菱パワー株式会社 filed Critical 三菱重工業株式会社
Publication of WO2022113924A1 publication Critical patent/WO2022113924A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the present invention relates to a scrubbering device for removing sulfur from exhaust gas, and more particularly to a scrubbering device having a heat exchanger that recovers heat from untreated exhaust gas and heats the treated exhaust gas.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2009-95697
  • the heat storage body (1) rotating about the rotation axis (9) has a portion through which the untreated gas passes and the treated gas.
  • a technique is described in which heat is recovered from untreated gas by passing through the passing portions in order, and the treated gas is heated (reheated) with the recovered heat.
  • the cleaning liquid is sprayed from above and below the heat storage body (1) by the water washing nozzles (8, 10) to wash with water.
  • Patent Document 2 Choinese Patent Publication No. 103063082: CN103063082A
  • high-pressure water is sprayed from a high-pressure shower (13) to a rotary GGH (gas gas heater, heat exchanger) similar to Patent Document 1.
  • GGH gas gas heater, heat exchanger
  • the exhaust gas of coal-fired power generation contains particles such as coal combustion ash, and particles such as coal combustion ash in the exhaust gas adhere to the element (heat transfer tube) of the heat exchanger during heat recovery. Therefore, as in the techniques described in Patent Documents 1 and 2, the portion through which the untreated gas flows is widely washed with a washing liquid.
  • the portion to which the coal combustion ash adheres during heat recovery enters the treated gas side as the GGH rotates. At this time, the treated gas side may contain a mist of an absorbing liquid for desulfurization, and the mist tends to fix particles such as coal combustion ash adhering to GGH and increase the pressure loss.
  • FIG. 4 is a schematic explanatory view of a desulfurization apparatus equipped with a conventional heat exchanger.
  • the rotary GGH 02 passes through the upstream portion 03 and the downstream portion 04 in which the untreated gas flows in order.
  • a washing machine 06 for washing the GGH 02 is arranged in the upstream portion 03.
  • an accommodating portion 07 in which the absorbing liquid is collected is arranged at the bottom portion, and an injector 08 for injecting the absorbing liquid is arranged below the GGH 02.
  • FIG. 4 is a schematic explanatory view of a desulfurization apparatus equipped with a conventional heat exchanger.
  • the washing liquid flowing down from GGH02 includes K (potassium), Na (sodium), Mg (magnesium), and F in coal ash. Contains (fluorine). If the washed-off cleaning liquid flows into the accommodating portion 07 and mixes with the desulfurization absorbing liquid, the concentration and pH of the absorbing liquid may change, resulting in deterioration of desulfurization performance.
  • the technical subject of the present invention is to prevent the cleaning liquid of the heat exchanger from being mixed with the absorption liquid for desulfurization.
  • the desulfurization apparatus of the invention according to claim 1 is A downstream portion of the flow path extending upward from the accommodating portion in which the absorbing liquid that absorbs sulfur in the exhaust gas is accommodated, and an inflow portion connected to the downstream portion of the flow path above the accommodating portion and into which the exhaust gas flows.
  • An exhaust gas flow path having a flow path upstream portion connected to the upstream side of the inflow portion, and an exhaust gas flow path.
  • An injector that injects the absorption liquid into the exhaust gas downstream of the flow path
  • a heat exchanger that recovers heat from the exhaust gas upstream of the flow path and heats the exhaust gas downstream of the injector in the flow direction of the exhaust gas.
  • a cleaning machine located upstream of the flow path and injecting cleaning liquid onto the heat exchanger.
  • a discharge section provided at the bottom of the upstream portion of the flow path to discharge the cleaning liquid, and a discharge section. It is arranged on the downstream side of the discharge portion and upstream of the position of the boundary between the inflow portion and the downstream portion of the flow path with respect to the gas flow direction, and causes the inflow of the cleaning liquid into the downstream portion of the flow path.
  • Regulatory members to regulate and It is characterized by being equipped with.
  • the invention according to claim 2 is the desulfurization apparatus according to claim 1.
  • the invention according to claim 3 is the desulfurization apparatus according to claim 2.
  • the return portion which inclines to the downstream side in the gas flow direction as it goes upward in the direction of gravity, It is characterized by being equipped with.
  • the invention according to claim 4 is the desulfurization apparatus according to any one of claims 1 to 3.
  • the regulating member which can appear and disappear with respect to the bottom surface of the exhaust gas flow path, It is characterized by being equipped with.
  • the invention according to claim 5 is the desulfurization apparatus according to claim 4.
  • the restricting member which protrudes from the bottom surface of the exhaust gas flow path when the cleaning machine sprays the cleaning liquid and is buried in the bottom surface of the exhaust gas flow path when the cleaning operation is completed. It is characterized by being equipped with.
  • the invention according to claim 6 is the desulfurization apparatus according to any one of claims 1 to 5.
  • the heat exchanger which is configured to be able to store heat and rotate around a rotation axis, and passes through the inside of the upstream portion of the flow path and the inside of the downstream portion of the flow path in order. It is characterized by being equipped with.
  • the invention according to claim 7 is the desulfurization apparatus according to any one of claims 1 to 6.
  • a control unit that controls the timing of injecting the washing machine based on the difference in pressure between the upstream side and the downstream side in the flow direction of the exhaust gas of the heat exchanger in the upstream portion of the flow path. It is characterized by being equipped with.
  • the invention according to claim 8 is the desulfurization apparatus according to any one of claims 1 to 7.
  • a circulation unit that circulates the cleaning liquid discharged from the discharge unit to the cleaning machine. It is characterized by being equipped with.
  • the invention according to claim 9 is the desulfurization apparatus according to claim 8.
  • a control unit that determines whether or not to circulate the cleaning liquid in the cleaning machine based on the pH of the cleaning liquid discharged from the discharging unit. It is characterized by being equipped with.
  • the invention according to claim 10 is the desulfurization apparatus according to any one of claims 1 to 9.
  • a water-sealing member provided in the discharge section that water-seals the inlet side of the cleaning liquid. It is characterized by being equipped with.
  • the invention according to claim 11 is the desulfurization apparatus according to claim 10.
  • the water-sealing member which is composed of a damper that closes the discharge portion. It is characterized by being equipped with.
  • the cleaning liquid of the heat exchanger it is possible to prevent the cleaning liquid of the heat exchanger from being mixed with the absorption liquid for desulfurization as compared with the case where the regulating member is not provided.
  • the turbulence of the gas flow can be suppressed as compared with the case where the return portion is not provided.
  • the invention of claim 3 in addition to the effect of the invention of claim 2, it is possible to reduce the generation of a vortex in the gas flow on the downstream side of the return portion.
  • the regulating member in addition to the effect of the invention of any one of claims 1 to 3, the regulating member can be projected when used and buried when not used.
  • the discharge part in addition to the effect of the invention of claim 8, when it is inappropriate to circulate the washing liquid based on pH, it is possible to prevent the circulation.
  • the discharge part in addition to the effect of the invention of any one of claims 1 to 9, the discharge part can be sealed with water and the gas can be prevented from leaking through the discharge part. ..
  • the invention of claim 11 in addition to the effect of the invention of claim 10, it can be sealed with a damper.
  • FIG. 1 is a schematic explanatory view of a desulfurization apparatus according to an embodiment of the present invention.
  • 2A and 2B are explanatory views of a modified example of the first embodiment
  • FIG. 2A is an explanatory diagram of the modified example 1 of the first embodiment
  • FIG. 2B is an explanatory diagram of the modified example 2 of the first embodiment.
  • FIG. 3 is an explanatory diagram of the desulfurization apparatus according to the second embodiment of the present invention.
  • FIG. 4 is a schematic explanatory view of a desulfurization apparatus equipped with a conventional heat exchanger.
  • FIG. 1 is a schematic explanatory view of a desulfurization apparatus according to an embodiment of the present invention.
  • the desulfurization apparatus 1 of the first embodiment of the present invention has an absorption tower 2. Inside the absorption tower 2, a storage portion 3 as an example of a storage portion for the absorbing liquid is formed at the bottom. An absorbing liquid (absorbent liquid slurry) is stored in the accommodating portion 3. Further, above the accommodating portion 3, a downstream portion 4 of the flow path through which the exhaust gas from the boiler (not shown) to which the desulfurization device 1 is connected passes extends.
  • the duct 6 is arranged in parallel with the downstream portion 4 of the flow path. Inside the duct 6, an upstream portion 7 of the flow path through which the exhaust gas passes is formed.
  • the exhaust gas flow path 9 of the first embodiment is configured by the flow path downstream portion 4, the flow path upstream portion 7, the inflow portion 8, and the like.
  • An absorbent liquid spray 11 as an example of an injector is arranged above the boundary portion (connection position) with the inflow portion 8 in the flow path upstream portion 7.
  • the absorbing liquid spray 11 desulfurizes the exhaust gas by injecting the absorbing liquid slurry of the accommodating portion 3 sent by the absorbing liquid slurry pump 12 toward the exhaust gas passing through the upstream portion 7 of the flow path.
  • a demista 13 as an example of a liquid recovery machine is arranged above the absorbent liquid spray 11. The demista 13 collects the droplet-like and mist-like (mist-like) absorption liquids ejected from the absorption liquid spray 11.
  • the GGH 21 of the first embodiment has a heat storage body 22 as an example of the heat exchanger main body.
  • the heat storage body 22 is formed in a disk shape.
  • the heat storage body 22 is rotatably supported around a rotation shaft 23 arranged between the flow path upstream portion 7 and the flow path downstream portion 4, and is rotated and driven by the motor 24. Therefore, a part (22a) of the heat storage body 22 has entered the flow path upstream portion 7 and another part (22b) has entered the flow path downstream portion 4.
  • the GGH21 of the first embodiment is composed of a conventionally known rotary type (Jungstrom type) GGH.
  • a cleaning spray 26 as an example of a cleaning machine is arranged above the heat storage body 22 (22a) in the upstream portion 7 of the flow path.
  • the cleaning spray 26 sprays the cleaning liquid supplied from the cleaning water pipe 27 toward the heat storage body 22 for cleaning.
  • the cleaning liquid can be injected to the entire heat storage body 22 by rotating the heat storage body 22 for one round or more.
  • a cleaning liquid discharge pipe 28 as an example of the discharge portion is connected to the bottom portion 7a of the flow path upstream portion 7.
  • a cleaning water pit 29 as an example of a storage portion for the cleaning liquid is arranged. The cleaning liquid accumulated in the cleaning water pit 29 is discharged when the amount exceeds a predetermined amount.
  • a damming plate 31 as an example of the regulating member is arranged between them.
  • the damming plate 31 of the first embodiment is formed in a plate shape that rises upward from the bottom surface near the upstream end of the inflow portion 8.
  • the damming plate 31 is formed to have a height and a width that can prevent (regulate) the liquid on the cleaning liquid discharge pipe 28 side from flowing into the accommodating portion 3.
  • the height and width can be arbitrarily changed according to the design and specifications such as the injection amount of the cleaning liquid used per unit time and the drainage capacity of the cleaning liquid discharge pipe 28.
  • the damming plate 31 is arranged between the scrubber discharge pipe 28 and the accommodating portion 3. Therefore, even if the cleaning liquid before flowing into the cleaning liquid discharge pipe 28 tries to move to the accommodating portion 3, it is blocked by the damming plate 31. Therefore, it is possible to prevent the cleaning liquid from flowing into and mixing with the accommodating portion 3. Therefore, it is suppressed that the desulfurization performance of the absorption liquid slurry is deteriorated by the cleaning liquid.
  • the damming plate 31 exemplifies a plate-like structure that stands upward from the bottom surface of the inflow portion 8, but is not limited thereto.
  • FIGS. 2A and 2B it is also possible to provide a return portion 31a ′, 31a ′′ inclined in the vertical direction at the upper end portion of the damming plate 31 ′, 31 ′′. .. As shown in FIG.
  • the shape of the inflow portion 8 (horizontally oriented, inclined with respect to the horizontal, etc.) differs depending on the conditions of the flow path, it can be arbitrarily changed according to the design or the like.
  • the upstream portion 7 of the flow path is a straight tube and the inflow portion 8 is oriented horizontally, the configuration shown in FIG. 2B makes it difficult for a vortex to form in the flow of exhaust gas on the downstream side of the upper end of the dam 31. Therefore, it is preferable.
  • FIG. 3 is an explanatory diagram of the desulfurization apparatus according to the second embodiment of the present invention.
  • a second embodiment of the present invention will be described.
  • the components corresponding to the components of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. do.
  • This Example 2 differs from the above-mentioned Example 1 in the following points, but is configured in the same manner as the above-mentioned Example 1 in other respects.
  • the damming plate 31 is configured to be able to appear and disappear with respect to the bottom surface 8b of the inflow portion 8.
  • the damming plate 31 of the second embodiment has a protruding position protruding with respect to the bottom surface 8b (the damming position, see the solid line in FIG. 3) and a buried position buried with respect to the bottom surface 8b (standby position, see the broken line in FIG. 3). ) Is configured to be movable.
  • the appearance and appearance of the dam 31 of the second embodiment is controlled by the arithmetic unit 41 as an example of the control unit.
  • pressure gauges SN1 and SN2 are arranged above and below the heat storage body 22 (22a) in the upstream portion 7 of the flow path, respectively.
  • the values measured by the pressure gauges SN1 and SN2 are input to the arithmetic unit 41.
  • the differential pressure ⁇ P of the pressure measured by the pressure gauges SN1 and SN2 is input to the calculator 41.
  • a damper 42 as an example of the water sealing member is arranged in the cleaning liquid discharge pipe 28 of the second embodiment.
  • the damper 42 opens / closes the cleaning liquid discharge pipe 28 to drain / stop the cleaning liquid.
  • the opening and closing of the damper 42 of the second embodiment is controlled by the arithmetic unit 41.
  • the damper 42 is exemplified in Example 2 as the water sealing member, the present invention is not limited to this.
  • a pH meter SN3 for measuring the pH of the washing liquid
  • a liquid meter SN4 for measuring the amount (water level) of the washing liquid are installed.
  • the washing water pit 29 is connected to a drain pipe 46 for draining from the washing water pit 29 and a circulation pipe 47 for circulating the washing water in the washing water pit 29.
  • the drain pipe 46 is opened and closed by the drain valve 46a, and drainage / drainage stop is performed through the drain pipe 46.
  • the drain valve 46a is controlled by the arithmetic unit 41.
  • the other end of the circulation pipe 47 joins the washing water pipe 27.
  • a cleaning liquid pump 48 for transferring the cleaning liquid is installed in the circulation pipe 47.
  • the circulation pipe 47 and the cleaning liquid pump 48 constitute the circulation portions 47 and 48 of the second embodiment. Therefore, when the cleaning liquid pump 48 operates, the cleaning liquid in the cleaning water pit 29 is sent to the cleaning spray 26 and injected into the GGH 21.
  • the cleaning water valve 49 of the cleaning water pipe 27 is opened and a new cleaning liquid is supplied.
  • the cleaning liquid pump 48 and the cleaning water valve 49 of the second embodiment are controlled by the arithmetic unit 41.
  • the arithmetic unit 41 of the desulfurization apparatus 1 of the second embodiment has an input / output interface I / O for inputting / outputting signals to / from the outside. Further, the arithmetic unit 41 has a ROM: read-only memory in which a program, information, and the like for performing necessary processing are stored. Further, the arithmetic unit 41 has a RAM: random access memory for temporarily storing necessary data. Further, the arithmetic unit 41 has a CPU: a central processing unit that performs processing according to a program stored in a ROM or the like. Therefore, the arithmetic unit 41 of the second embodiment is composed of an information processing device, a so-called computer device. Therefore, the arithmetic unit 41 can realize various functions by executing the program stored in the ROM or the like.
  • the arithmetic unit 41 includes a damming plate 31, a damper 42, a drain valve 46a, a cleaning liquid pump 48, a cleaning water valve 49, etc., in response to input signals from the pressure meters SN1 and SN2, the pH meter SN3, the liquid meter SN4, and the like. Control is done.
  • the arithmetic unit 41 of the second embodiment determines that coal combustion ash and the like are accumulated in the heat storage body 22 and the exhaust gas is difficult to flow. , It is determined that it is time to wash the GGH21.
  • the calculator 41 determines that it is time to clean the GGH 21, it notifies the operator to that effect by a notification method such as image display or voice guidance. Upon receiving the notification, the worker will systematically stop the boiler according to the operating status of the boiler and start the cleaning work.
  • a notification method such as image display or voice guidance.
  • the arithmetic unit 41 of the second embodiment moves the damming plate 31 from the buried position to the protruding position.
  • the arithmetic unit 41 moves the damming plate 31 from the protruding position to the buried position.
  • the arithmetic unit 41 of the second embodiment operates the damper 42 to open the cleaning liquid discharge pipe 28.
  • the arithmetic unit 41 will use the cleaning water if the pH of the cleaning liquid in the cleaning water pit 29 is within a predetermined value based on the detection result of the pH meter SN3.
  • the cleaning liquid in the pit 29 is circulated and controlled to perform cleaning.
  • the cleaning liquid pump 48 is operated and the cleaning water valve 49 is held in a closed state. Therefore, the cleaning liquid in the cleaning water pit 29 is used to clean the GGH 21.
  • the arithmetic unit 41 controls to perform cleaning without circulating the cleaning liquid in the cleaning water pit 29. In this case, the cleaning liquid pump 48 is stopped and the cleaning water valve 49 is opened. Therefore, a new cleaning liquid is supplied to clean the GGH21.
  • the arithmetic unit 41 controls the drain valve 46a and the damper 42 based on the detection result of the liquid level meter SN4.
  • the arithmetic unit 41 of the second embodiment opens the drain valve 46a to wash water. Control so that the cleaning liquid in the pit 29 does not overflow. If the amount of liquid does not reach the upper limit, the drain valve 46a is closed.
  • the arithmetic unit 41 of the second embodiment when the amount of the cleaning liquid in the cleaning water pit 29 is lower than the predetermined lower limit amount in the situation where the cleaning work is not performed from the detection result of the liquid amount meter SN4. Controls to operate the damper 42 to close the cleaning liquid discharge pipe 28.
  • the damming plate 31 moves to the protruding position to prevent the cleaning liquid from flowing into the accommodating portion 3, and the cleaning work is not performed, that is, In the situation where the boiler is operating, the dam 31 does not protrude into the inflow portion 8. Therefore, it is possible to prevent the dam 31 from disturbing the flow of exhaust gas while the boiler is in operation (during desulfurization).
  • the damper 42 closes the cleaning liquid discharge pipe 28.
  • Example 2 When the amount of the cleaning liquid in the cleaning water pit 29 becomes small and the cleaning liquid inside the cleaning liquid discharge pipe 28 does not exist, a part of the exhaust gas flowing in the upstream portion 7 of the flow path flows through the cleaning liquid discharge pipe 28, and the exhaust gas flow path. There is a risk of leaking to the outside of 9.
  • Example 2 if the damper 42 closes the cleaning liquid discharge pipe 28 before the cleaning liquid is exhausted from the cleaning liquid discharge pipe 28, the cleaning liquid remains above the damper 42. That is, it is in a water-sealed state. Therefore, it is possible to prevent the exhaust gas from leaking to the outside of the exhaust gas flow path 9. Although it is desirable to provide a water-sealing configuration, it is possible not to provide a water-sealing configuration as long as the amount of liquid in the washing water pit 29 is controlled to be substantially constant.
  • the shape of the return portion 31a', 31a is not limited to the exemplified shape, and can be changed to an arbitrary shape such as an arc-shaped curved shape or a polygonal columnar shape.
  • the installation position, size, and the like of the damming plate 31 are not limited to the positions exemplified in the embodiment.
  • the installation position may be arranged closer to the accommodating portion 3 or closer to the cleaning liquid discharge pipe 28 than the position illustrated in the embodiment. Further, in the case of a configuration that can appear and disappear as in the second embodiment, it is possible to make the inflow portion 8 completely closed at the protruding position.
  • the cleaning liquid that flows into the cleaning water pit 29 immediately after cleaning contains a large amount of coal combustion ash (severely dirty), and the amount of coal combustion ash and the like contained in the cleaning liquid that flows in after a lapse of time from the start of cleaning decreases. Therefore, it is possible to control that the washing liquid that flows in is discharged for a predetermined few minutes from the start of washing, and after that, the washing liquid is sent to the washing water pit 29 and circulated for use.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

A desulfurizing device (1) is provided with: a heat exchanger (21) which recovers heat from exhaust gas in a flow passage upstream portion (7), and which uses the recovered heat to heat the exhaust gas on the downstream side of a sprayer (11) in the direction of flow of the exhaust gas; a washing machine (26) which is disposed in the flow passage upstream portion (7) and which sprays a washing solution onto the heat exchanger (21); a discharge portion (28) which is provided in a bottom portion of the flow passage upstream portion (7) to discharge the washing solution; and a restricting member (31) which is disposed on the downstream side of the discharge portion (28) in the direction of flow of the gas and on the upstream side of the position of a boundary (8a) between an inflow portion (8) and a flow passage downstream portion (4), and which restricts the flow of the washing solution into the flow passage downstream portion (4). It is thus possible to suppress contamination by the heat exchanger washing solution of an absorption solution for desulfurization.

Description

脱硫装置Desulfurization equipment
　本発明は、排ガス中から硫黄分を除去する脱硫装置に関し、特に、処理前の排ガスから熱を回収して、処理後の排ガスを加熱する熱交換器を有する脱硫装置に関する。 The present invention relates to a scrubbering device for removing sulfur from exhaust gas, and more particularly to a scrubbering device having a heat exchanger that recovers heat from untreated exhaust gas and heats the treated exhaust gas.
　ボイラ等における排煙（排ガス）に含まれる硫黄分を除去する脱硫装置において、脱硫装置の吸収塔内において排ガスを吸収液と接触させる湿式の脱硫装置が公知である。湿式の脱硫装置では、吸収塔出口における排ガスは水分飽和ガスとなり、ＳＯ3ミストによる腐食の原因や煙突出口で紫煙などが生じる原因となる。これを防止するために吸収塔の出口に、ガス再加熱装置を設置して排ガスの温度を高めて煙突から排出するのが一般的である。
　排ガスの加熱を行う技術として、下記の特許文献１，２に記載の技術が公知である。 As a scrubber for removing sulfur contained in flue gas (exhaust gas) in a boiler or the like, a wet scrubber that brings the exhaust gas into contact with an absorbing liquid in the absorption tower of the scrubber is known. In a wet desulfurization device, the exhaust gas at the outlet of the absorption tower becomes a water-saturated gas, which causes corrosion due to SO 3 mist and causes purple smoke at the chimney outlet. In order to prevent this, it is common to install a gas reheating device at the outlet of the absorption tower to raise the temperature of the exhaust gas and discharge it from the chimney.
As a technique for heating exhaust gas, the techniques described in the following Patent Documents 1 and 2 are known.
　特許文献１（特開２００９－９５６９７号公報）には、回転軸（９）を中心として回転する蓄熱体（１）が、脱硫処理が未処理のガスが通過する部分と、処理済みのガスが通過する部分を順に通過することで、未処理のガスから熱を回収し、回収した熱で処理済みのガスを加熱（再加熱）する技術が記載されている。特許文献１に記載の技術では、未処理のガスが通過するガス流路において、蓄熱体（１）の上下から水洗ノズル（８，１０）で洗浄液を噴射して水洗している。 In Patent Document 1 (Japanese Unexamined Patent Publication No. 2009-95697), the heat storage body (1) rotating about the rotation axis (9) has a portion through which the untreated gas passes and the treated gas. A technique is described in which heat is recovered from untreated gas by passing through the passing portions in order, and the treated gas is heated (reheated) with the recovered heat. In the technique described in Patent Document 1, in the gas flow path through which the untreated gas passes, the cleaning liquid is sprayed from above and below the heat storage body (1) by the water washing nozzles (8, 10) to wash with water.
　特許文献２（中国特許公開公報第１０３０６３０８２号：ＣＮ１０３０６３０８２Ａ）には、特許文献１と同様の回転式のＧＧＨ（ガスガスヒータ、熱交換器）に対して、高圧シャワー（１３）から高圧水を噴射してＧＧＨを洗浄したり、ジェット（４２）から薬液を噴射して洗浄する技術が記載されている。 In Patent Document 2 (Chinese Patent Publication No. 103063082: CN103063082A), high-pressure water is sprayed from a high-pressure shower (13) to a rotary GGH (gas gas heater, heat exchanger) similar to Patent Document 1. A technique for cleaning GGH or spraying a chemical solution from a jet (42) for cleaning is described.
特開２００９－９５６９７号公報（「００１６」－「００１９」、図１、図２）Japanese Unexamined Patent Publication No. 2009-95697 ("0016"-"0019", FIGS. 1 and 2) 中国特許公開公報第１０３０６３０８２号（図１）Chinese Patent Publication No. 103063082 (Fig. 1)
　石炭火力発電の排ガスには、石炭燃焼灰等の粒子が含まれており、熱回収時に熱交換器のエレメント（伝熱管）には排ガス中の石炭燃焼灰等の粒子が付着する。したがって、特許文献１，２に記載の技術のように、未処理のガスが流れる部分は、洗浄液で洗浄することが広く行われている。
　特に、特許文献１，２のような回転型（ユングストローム型）のＧＧＨでは、熱回収時に石炭燃焼灰が付着した部分が、ＧＧＨの回転に伴って、処理済みのガス側に進入する。この時、処理済みのガス側には、脱硫用の吸収液のミストが含まれていることがあり、ミストによりＧＧＨに付着した石炭燃焼灰等の粒子が固着化して圧力損失が増加しやすい。 The exhaust gas of coal-fired power generation contains particles such as coal combustion ash, and particles such as coal combustion ash in the exhaust gas adhere to the element (heat transfer tube) of the heat exchanger during heat recovery. Therefore, as in the techniques described in Patent Documents 1 and 2, the portion through which the untreated gas flows is widely washed with a washing liquid.
In particular, in the rotary type (Jungstrom type) GGH as in Patent Documents 1 and 2, the portion to which the coal combustion ash adheres during heat recovery enters the treated gas side as the GGH rotates. At this time, the treated gas side may contain a mist of an absorbing liquid for desulfurization, and the mist tends to fix particles such as coal combustion ash adhering to GGH and increase the pressure loss.
　図４は従来技術の熱交換器を備えた脱硫装置の概略説明図である。
　図４において、特許文献１，２のような脱硫装置０１では、回転式のＧＧＨ０２は、未処理のガスが流れる上流部０３と、下流部０４を順に通過する。上流部０３には、ＧＧＨ０２を洗浄する洗浄機０６が配置されている。また、下流部０４には、底部に吸収液が溜まる収容部０７が配置され、ＧＧＨ０２の下方に吸収液を噴射する噴射器０８が配置されている。
　図４において、特許文献１，２のように洗浄機０６でＧＧＨ０２を洗浄する場合に、ＧＧＨ０２から流れ落ちる洗浄液には、石炭灰中のＫ（カリウム）、Ｎａ（ナトリウム）、Ｍｇ（マグネシウム）、Ｆ（フッ素）が含まれている。この流れ落ちた洗浄液が、収容部０７に流れ込んで脱硫用の吸収液に混入すると、吸収液の濃度やｐＨ等が変化して、脱硫性能の低下を招く恐れがある。 FIG. 4 is a schematic explanatory view of a desulfurization apparatus equipped with a conventional heat exchanger.
In FIG. 4, in the desulfurization apparatus 01 as in Patent Documents 1 and 2, the rotary GGH 02 passes through the upstream portion 03 and the downstream portion 04 in which the untreated gas flows in order. A washing machine 06 for washing the GGH 02 is arranged in the upstream portion 03. Further, in the downstream portion 04, an accommodating portion 07 in which the absorbing liquid is collected is arranged at the bottom portion, and an injector 08 for injecting the absorbing liquid is arranged below the GGH 02.
In FIG. 4, when GGH02 is washed with a washing machine 06 as in Patent Documents 1 and 2, the washing liquid flowing down from GGH02 includes K (potassium), Na (sodium), Mg (magnesium), and F in coal ash. Contains (fluorine). If the washed-off cleaning liquid flows into the accommodating portion 07 and mixes with the desulfurization absorbing liquid, the concentration and pH of the absorbing liquid may change, resulting in deterioration of desulfurization performance.
　本発明は、熱交換器の洗浄液が脱硫用の吸収液に混入することを抑制することを技術的課題とする。 The technical subject of the present invention is to prevent the cleaning liquid of the heat exchanger from being mixed with the absorption liquid for desulfurization.
　上記本発明の課題は、下記の構成を採用することにより達成できる。
　請求項１に記載の発明の脱硫装置は、
　排ガス中の硫黄分を吸収する吸収液が収容される収容部から上方に延びる流路下流部と、前記収容部よりも上方で前記流路下流部に接続されて排ガスが流入する流入部と、前記流入部の上流側に接続された流路上流部と、を有する排ガス流路と、
　前記流路下流部の排ガスに前記吸収液を噴射する噴射器と、
　前記流路上流部の排ガスから熱を回収すると共に、排ガスの流れ方向に対して前記噴射器よりも下流側の排ガスに回収した熱で加熱する熱交換器と、
　前記流路上流部に配置されて前記熱交換器に洗浄液を噴射する洗浄機と、
　前記流路上流部の底部に設けられて、洗浄液を排出する排出部と、
　ガスの流れ方向に対して、前記排出部よりも下流側且つ前記流入部と前記流路下流部との境界の位置よりも上流側に配置され、前記洗浄液の前記流路下流部への流入を規制する規制部材と、
　を備えたことを特徴とする。 The above-mentioned problem of the present invention can be achieved by adopting the following configuration.
The desulfurization apparatus of the invention according to claim 1 is
A downstream portion of the flow path extending upward from the accommodating portion in which the absorbing liquid that absorbs sulfur in the exhaust gas is accommodated, and an inflow portion connected to the downstream portion of the flow path above the accommodating portion and into which the exhaust gas flows. An exhaust gas flow path having a flow path upstream portion connected to the upstream side of the inflow portion, and an exhaust gas flow path.
An injector that injects the absorption liquid into the exhaust gas downstream of the flow path,
A heat exchanger that recovers heat from the exhaust gas upstream of the flow path and heats the exhaust gas downstream of the injector in the flow direction of the exhaust gas.
A cleaning machine located upstream of the flow path and injecting cleaning liquid onto the heat exchanger.
A discharge section provided at the bottom of the upstream portion of the flow path to discharge the cleaning liquid, and a discharge section.
It is arranged on the downstream side of the discharge portion and upstream of the position of the boundary between the inflow portion and the downstream portion of the flow path with respect to the gas flow direction, and causes the inflow of the cleaning liquid into the downstream portion of the flow path. Regulatory members to regulate and
It is characterized by being equipped with.
　請求項２に記載の発明は、請求項１に記載の脱硫装置において、
　前記規制部材の重力方向の上端部に形成され、重力方向に対して傾斜する返し部、
　を備えたことを特徴とする。 The invention according to claim 2 is the desulfurization apparatus according to claim 1.
A barb formed at the upper end of the restricting member in the direction of gravity and inclined with respect to the direction of gravity,
It is characterized by being equipped with.
　請求項３に記載の発明は、請求項２に記載の脱硫装置において、
　重力方向の上方に行くにつれてガスの流れ方向の下流側に傾斜する前記返し部、
　を備えたことを特徴とする。 The invention according to claim 3 is the desulfurization apparatus according to claim 2.
The return portion, which inclines to the downstream side in the gas flow direction as it goes upward in the direction of gravity,
It is characterized by being equipped with.
　請求項４に記載の発明は、請求項１ないし３のいずれかに記載の脱硫装置において、
　前記排ガス流路の底面に対して出没可能な前記規制部材、
　を備えたことを特徴とする。 The invention according to claim 4 is the desulfurization apparatus according to any one of claims 1 to 3.
The regulating member, which can appear and disappear with respect to the bottom surface of the exhaust gas flow path,
It is characterized by being equipped with.
　請求項５に記載の発明は、請求項４に記載の脱硫装置において、
　前記洗浄機が洗浄液を噴射する洗浄作業が行われる場合に、前記排ガス流路の底面に対して突出し、前記洗浄作業が終了すると前記排ガス流路の底面に対して埋没する前記規制部材、
　を備えたことを特徴とする。 The invention according to claim 5 is the desulfurization apparatus according to claim 4.
The restricting member, which protrudes from the bottom surface of the exhaust gas flow path when the cleaning machine sprays the cleaning liquid and is buried in the bottom surface of the exhaust gas flow path when the cleaning operation is completed.
It is characterized by being equipped with.
　請求項６に記載の発明は、請求項１ないし５のいずれかに記載の脱硫装置において、
　熱を蓄積可能且つ回転軸を中心として回転可能に構成され、前記流路上流部の内部と前記流路下流部の内部とを順に通過する前記熱交換器、
　を備えたことを特徴とする。 The invention according to claim 6 is the desulfurization apparatus according to any one of claims 1 to 5.
The heat exchanger, which is configured to be able to store heat and rotate around a rotation axis, and passes through the inside of the upstream portion of the flow path and the inside of the downstream portion of the flow path in order.
It is characterized by being equipped with.
　請求項７に記載の発明は、請求項１ないし６のいずれかに記載の脱硫装置において、
　前記流路上流部における前記熱交換器の排ガスの流れ方向の上流側と下流側との圧力の差に基づいて、前記洗浄機を噴射する時期を制御する制御部、
　を備えたことを特徴とする。 The invention according to claim 7 is the desulfurization apparatus according to any one of claims 1 to 6.
A control unit that controls the timing of injecting the washing machine based on the difference in pressure between the upstream side and the downstream side in the flow direction of the exhaust gas of the heat exchanger in the upstream portion of the flow path.
It is characterized by being equipped with.
　請求項８に記載の発明は、請求項１ないし７のいずれかに記載の脱硫装置において、
　前記排出部から排出された洗浄液を前記洗浄機に循環させる循環部、
　を備えたことを特徴とする。 The invention according to claim 8 is the desulfurization apparatus according to any one of claims 1 to 7.
A circulation unit that circulates the cleaning liquid discharged from the discharge unit to the cleaning machine.
It is characterized by being equipped with.
　請求項９に記載の発明は、請求項８に記載の脱硫装置において、
　前記排出部から排出された洗浄液のｐＨに基づいて、前記洗浄液を前記洗浄機に循環させるか否かを判別する制御部、
　を備えたことを特徴とする。 The invention according to claim 9 is the desulfurization apparatus according to claim 8.
A control unit that determines whether or not to circulate the cleaning liquid in the cleaning machine based on the pH of the cleaning liquid discharged from the discharging unit.
It is characterized by being equipped with.
　請求項１０に記載の発明は、請求項１ないし９のいずれかに記載の脱硫装置において、
　前記排出部に設けられ、洗浄液の入口側を水封する水封部材、
　を備えたことを特徴とする。 The invention according to claim 10 is the desulfurization apparatus according to any one of claims 1 to 9.
A water-sealing member provided in the discharge section that water-seals the inlet side of the cleaning liquid.
It is characterized by being equipped with.
　請求項１１に記載の発明は、請求項１０に記載の脱硫装置において、
　前記排出部を閉止するダンパにより構成された前記水封部材、
　を備えたことを特徴とする。 The invention according to claim 11 is the desulfurization apparatus according to claim 10.
The water-sealing member, which is composed of a damper that closes the discharge portion.
It is characterized by being equipped with.
　請求項１に記載の発明によれば、規制部材を有しない場合に比べて、熱交換器の洗浄液が脱硫用の吸収液に混入することを抑制することができる。
　請求項２に記載の発明によれば、請求項１に記載の発明の効果に加えて、返し部を有しない場合に比べて、ガスの流れの乱れを抑制できる。
　請求項３に記載の発明によれば、請求項２に記載の発明の効果に加えて、返し部の下流側でガスの流れに渦が発生することを低減できる。
　請求項４に記載の発明によれば、請求項１ないし３のいずれかに記載の発明の効果に加えて、規制部材を使用する際に突出させ、使用しない場合に埋没させることができる。 According to the first aspect of the present invention, it is possible to prevent the cleaning liquid of the heat exchanger from being mixed with the absorption liquid for desulfurization as compared with the case where the regulating member is not provided.
According to the second aspect of the present invention, in addition to the effect of the invention according to the first aspect, the turbulence of the gas flow can be suppressed as compared with the case where the return portion is not provided.
According to the invention of claim 3, in addition to the effect of the invention of claim 2, it is possible to reduce the generation of a vortex in the gas flow on the downstream side of the return portion.
According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the regulating member can be projected when used and buried when not used.
　請求項５に記載の発明によれば、請求項４に記載の発明の効果に加えて、洗浄が行われていない場合に、規制部材が排ガスの流れを乱すことを防止できる。
　請求項６に記載の発明によれば、請求項１ないし５のいずれかに記載の発明の効果に加えて、回転式の熱交換器を洗浄する際の洗浄液が、脱硫用の吸収液に混入することを抑制できる。
　請求項７に記載の発明によれば、請求項１ないし６のいずれかに記載の発明の効果に加えて、圧力差に基づいて熱交換器の洗浄時期を自動的に判別できる。
　請求項８に記載の発明によれば、請求項１ないし７のいずれかに記載の発明の効果に加えて、洗浄液を循環させない場合に比べて、環境負荷を低減でき、費用も削減できる。 According to the invention of claim 5, in addition to the effect of the invention of claim 4, it is possible to prevent the restricting member from disturbing the flow of exhaust gas when cleaning is not performed.
According to the invention according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, a cleaning liquid for cleaning a rotary heat exchanger is mixed with an absorption liquid for desulfurization. Can be suppressed.
According to the invention according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 6, the cleaning time of the heat exchanger can be automatically determined based on the pressure difference.
According to the invention of claim 8, in addition to the effect of the invention of any one of claims 1 to 7, the environmental load can be reduced and the cost can be reduced as compared with the case where the cleaning liquid is not circulated.
　請求項９に記載の発明によれば、請求項８に記載の発明の効果に加えて、ｐＨに基づいて洗浄液が循環させるほうが不適切な場合に、循環させないようにすることができる。
　請求項１０に記載の発明によれば、請求項１ないし９のいずれかに記載の発明の効果に加えて、排出部を水封することができ、排出部を通じてガスが漏れだすことを防止できる。
　請求項１１に記載の発明によれば、請求項１０に記載の発明の効果に加えて、ダンパで水封することができる。 According to the invention of claim 9, in addition to the effect of the invention of claim 8, when it is inappropriate to circulate the washing liquid based on pH, it is possible to prevent the circulation.
According to the invention of claim 10, in addition to the effect of the invention of any one of claims 1 to 9, the discharge part can be sealed with water and the gas can be prevented from leaking through the discharge part. ..
According to the invention of claim 11, in addition to the effect of the invention of claim 10, it can be sealed with a damper.
図１は本発明の一実施例の脱硫装置の概略説明図である。FIG. 1 is a schematic explanatory view of a desulfurization apparatus according to an embodiment of the present invention. 図２は実施例１の変更例の説明図であり、図２（Ａ）は実施例１の変更例１の説明図、図２（Ｂ）は実施例１の変更例２の説明図である。2A and 2B are explanatory views of a modified example of the first embodiment, FIG. 2A is an explanatory diagram of the modified example 1 of the first embodiment, and FIG. 2B is an explanatory diagram of the modified example 2 of the first embodiment. .. 図３は本発明の実施例２の脱硫装置の説明図である。FIG. 3 is an explanatory diagram of the desulfurization apparatus according to the second embodiment of the present invention. 図４は従来技術の熱交換器を備えた脱硫装置の概略説明図である。FIG. 4 is a schematic explanatory view of a desulfurization apparatus equipped with a conventional heat exchanger.
　次に図面を参照しながら、本発明の実施の形態の具体例としての実施例を説明するが、本発明は以下の実施例に限定されるものではない。
　なお、以下の図面を使用した説明において、理解の容易のために説明に必要な部材以外の図示は適宜省略されている。 Next, an embodiment as a specific example of the embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.
In addition, in the explanation using the following drawings, the illustrations other than the members necessary for the explanation are omitted as appropriate for the sake of easy understanding.
　図１は本発明の一実施例の脱硫装置の概略説明図である。
　図１において、本発明の実施例１の脱硫装置１では、吸収塔２を有する。吸収塔２の内部には、底部に、吸収液の貯留部の一例としての収容部３が形成されている。収容部３には、吸収液（吸収液スラリ）が収容されている。また、収容部３から上方には、脱硫装置１が接続されているボイラ（図示せず）からの排ガスが通過する流路下流部４が延びている。
　流路下流部４に平行する形で、ダクト６が配置されている。ダクト６の内部には、排ガスが通過する流路上流部７が形成されている。流路上流部７の下端には、吸収塔２に向けて延びる流入部８の一端（上流端）が接続されている。流入部８の他端（下流端）は、流路下流部４の下部であって、収容部３の上方の位置に接続されている。
　流路下流部４、流路上流部７、流入部８等によって、実施例１の排ガス流路９が構成されている。 FIG. 1 is a schematic explanatory view of a desulfurization apparatus according to an embodiment of the present invention.
In FIG. 1, the desulfurization apparatus 1 of the first embodiment of the present invention has an absorption tower 2. Inside the absorption tower 2, a storage portion 3 as an example of a storage portion for the absorbing liquid is formed at the bottom. An absorbing liquid (absorbent liquid slurry) is stored in the accommodating portion 3. Further, above the accommodating portion 3, a downstream portion 4 of the flow path through which the exhaust gas from the boiler (not shown) to which the desulfurization device 1 is connected passes extends.
The duct 6 is arranged in parallel with the downstream portion 4 of the flow path. Inside the duct 6, an upstream portion 7 of the flow path through which the exhaust gas passes is formed. One end (upstream end) of the inflow portion 8 extending toward the absorption tower 2 is connected to the lower end of the flow path upstream portion 7. The other end (downstream end) of the inflow portion 8 is the lower portion of the flow path downstream portion 4 and is connected to a position above the accommodating portion 3.
The exhaust gas flow path 9 of the first embodiment is configured by the flow path downstream portion 4, the flow path upstream portion 7, the inflow portion 8, and the like.
　流路上流部７には、流入部８との境界部分（接続位置）よりも上方に、噴射器の一例としての吸収液スプレ１１が配置されている。吸収液スプレ１１は、吸収液スラリポンプ１２で送られた収容部３の吸収液スラリを、流路上流部７を通過する排ガスに向けて噴射することで、排ガスの脱硫を行う。
　吸収液スプレ１１の上方には、液回収機の一例としてのデミスタ１３が配置されている。デミスタ１３は、吸収液スプレ１１から噴射された液滴状、霧状（ミスト状）の吸収液を回収する。 An absorbent liquid spray 11 as an example of an injector is arranged above the boundary portion (connection position) with the inflow portion 8 in the flow path upstream portion 7. The absorbing liquid spray 11 desulfurizes the exhaust gas by injecting the absorbing liquid slurry of the accommodating portion 3 sent by the absorbing liquid slurry pump 12 toward the exhaust gas passing through the upstream portion 7 of the flow path.
A demista 13 as an example of a liquid recovery machine is arranged above the absorbent liquid spray 11. The demista 13 collects the droplet-like and mist-like (mist-like) absorption liquids ejected from the absorption liquid spray 11.
　デミスタ１３の上方には、熱交換器の一例としてのＧＧＨ２１が配置されている。実施例１のＧＧＨ２１は、熱交換器本体の一例としての蓄熱体２２を有する。蓄熱体２２は、円板状に形成されている。蓄熱体２２は、流路上流部７と流路下流部４との間に配置された回転軸２３を中心として回転可能に支持されており、モータ２４で回転、駆動される。したがって、蓄熱体２２は、その一部（２２ａ）が流路上流部７に進入し且つ別の一部（２２ｂ）が流路下流部４に進入した状態となる。そして、蓄熱体２２は、流路上流部７に進入した部分（２２ａ）が排ガスから熱を回収し、蓄熱体２２の回転に伴って流路下流部４に進入すると、流路下流部４を通過する排ガスが再加熱される。
　したがって、実施例１のＧＧＨ２１は、従来公知の回転型（ユングストローム型）のＧＧＨにより構成されている。 Above the demista 13, a GGH 21 as an example of a heat exchanger is arranged. The GGH 21 of the first embodiment has a heat storage body 22 as an example of the heat exchanger main body. The heat storage body 22 is formed in a disk shape. The heat storage body 22 is rotatably supported around a rotation shaft 23 arranged between the flow path upstream portion 7 and the flow path downstream portion 4, and is rotated and driven by the motor 24. Therefore, a part (22a) of the heat storage body 22 has entered the flow path upstream portion 7 and another part (22b) has entered the flow path downstream portion 4. Then, when the portion (22a) that has entered the flow path upstream portion 7 recovers heat from the exhaust gas and enters the flow path downstream portion 4 with the rotation of the heat storage body 22, the heat storage body 22 enters the flow path downstream portion 4. The passing exhaust gas is reheated.
Therefore, the GGH21 of the first embodiment is composed of a conventionally known rotary type (Jungstrom type) GGH.
　流路上流部７には、蓄熱体２２（２２ａ）の上方に、洗浄機の一例としての洗浄スプレ２６が配置されている。洗浄スプレ２６は、洗浄水パイプ２７から供給される洗浄液を蓄熱体２２に向けて噴射して洗浄する。なお、洗浄スプレ２６で洗浄液を噴射した状態で、蓄熱体２２が１周以上回転することで、蓄熱体２２の全体に洗浄液を噴射可能である。
　流路上流部７の底部７ａには、排出部の一例としての洗浄液排出管２８が接続されている。洗浄液排出管２８の下端には、洗浄液の貯留部の一例としての洗浄水ピット２９が配置されている。洗浄水ピット２９にたまった洗浄液は、量が所定量以上になると排出される。 A cleaning spray 26 as an example of a cleaning machine is arranged above the heat storage body 22 (22a) in the upstream portion 7 of the flow path. The cleaning spray 26 sprays the cleaning liquid supplied from the cleaning water pipe 27 toward the heat storage body 22 for cleaning. In the state where the cleaning liquid is injected by the cleaning spray 26, the cleaning liquid can be injected to the entire heat storage body 22 by rotating the heat storage body 22 for one round or more.
A cleaning liquid discharge pipe 28 as an example of the discharge portion is connected to the bottom portion 7a of the flow path upstream portion 7. At the lower end of the cleaning liquid discharge pipe 28, a cleaning water pit 29 as an example of a storage portion for the cleaning liquid is arranged. The cleaning liquid accumulated in the cleaning water pit 29 is discharged when the amount exceeds a predetermined amount.
　排ガスの流れ方向に対して洗浄液排出管２８よりも下流側且つ流入部８と流路下流部４との境界の位置８ａよりも上流側の位置、すなわち、洗浄液排出管２８と収容部３との間には、規制部材の一例としての堰き止め板３１が配置されている。
　実施例１の堰き止め板３１は、流入部８の上流端の近傍の底面から上方に起立する板状に形成されている。堰き止め板３１は、洗浄液排出管２８側の液体が収容部３側に流入することを妨げる（規制する）ことが可能な高さ、幅に形成されている。高さや幅は、使用される洗浄液の単位時間当たりの噴射量や洗浄液排出管２８の排水能力等の設計や仕様に応じて、任意に変更可能である。 A position downstream of the cleaning liquid discharge pipe 28 and upstream of the boundary position 8a between the inflow portion 8 and the flow path downstream portion 4, that is, the cleaning liquid discharge pipe 28 and the accommodating portion 3 with respect to the flow direction of the exhaust gas. A damming plate 31 as an example of the regulating member is arranged between them.
The damming plate 31 of the first embodiment is formed in a plate shape that rises upward from the bottom surface near the upstream end of the inflow portion 8. The damming plate 31 is formed to have a height and a width that can prevent (regulate) the liquid on the cleaning liquid discharge pipe 28 side from flowing into the accommodating portion 3. The height and width can be arbitrarily changed according to the design and specifications such as the injection amount of the cleaning liquid used per unit time and the drainage capacity of the cleaning liquid discharge pipe 28.
（実施例１の作用）
　前記構成を備えた実施例１の脱硫装置１では、吸収液スラリの噴射前の未処理の排ガスが通過する流路上流部７では、蓄熱体２２に経時的に石炭燃焼灰等が付着していく。また、蓄熱体２２の回転に伴って流路下流部４において、デミスタ１３で回収しきれなかったミスト状の吸収液と石炭燃焼灰等との接触で、石炭燃焼灰等が蓄熱体２２に固着する恐れがある。これに対して、定期メンテナンス時等に洗浄スプレ２６から洗浄液が噴射されて、蓄熱体２２が清掃される。蓄熱体２２に噴射された洗浄液は流路上流部７を落下して、底部の洗浄液排出管２８から排液される。 (Action of Example 1)
In the desulfurization apparatus 1 of the first embodiment having the above configuration, coal combustion ash or the like adheres to the heat storage body 22 over time in the upstream portion 7 of the flow path through which the untreated exhaust gas before the injection of the absorption liquid slurry passes. go. Further, in the downstream portion 4 of the flow path due to the rotation of the heat storage body 22, the coal combustion ash or the like adheres to the heat storage body 22 due to the contact between the mist-like absorbing liquid that could not be recovered by the demista 13 and the coal combustion ash or the like. There is a risk of doing. On the other hand, the cleaning liquid is sprayed from the cleaning spray 26 at the time of regular maintenance or the like to clean the heat storage body 22. The cleaning liquid sprayed on the heat storage body 22 falls down the upstream portion 7 of the flow path and is discharged from the cleaning liquid discharge pipe 28 at the bottom.
　ここで、堰き止め板３１を有しない従来の構成では、洗浄液排出管２８に流れ込む前の洗浄液の一部が、吸収液スラリの収容部３に流れ込む恐れがあり、吸収液スラリの脱硫性能が低下する恐れがあった。
　これに対して、実施例１の脱硫装置１では、洗浄液排出管２８と収容部３との間に堰き止め板３１が配置されている。したがって、洗浄液排出管２８に流れ込む前の洗浄液が収容部３側に移動しようとしても、堰き止め板３１で堰き止められる。よって、収容部３側に洗浄液が流入、混入することが抑制される。したがって、吸収液スラリの脱硫性能が洗浄液で低下することが抑制される。 Here, in the conventional configuration without the damming plate 31, a part of the cleaning liquid before flowing into the cleaning liquid discharge pipe 28 may flow into the accommodating portion 3 of the absorbing liquid slurry, and the desulfurization performance of the absorbing liquid slurry is deteriorated. I was afraid to do it.
On the other hand, in the desulfurization apparatus 1 of the first embodiment, the damming plate 31 is arranged between the scrubber discharge pipe 28 and the accommodating portion 3. Therefore, even if the cleaning liquid before flowing into the cleaning liquid discharge pipe 28 tries to move to the accommodating portion 3, it is blocked by the damming plate 31. Therefore, it is possible to prevent the cleaning liquid from flowing into and mixing with the accommodating portion 3. Therefore, it is suppressed that the desulfurization performance of the absorption liquid slurry is deteriorated by the cleaning liquid.
（実施例１の変更例）
　図２は実施例１の変更例の説明図であり、図２（Ａ）は実施例１の変更例１の説明図、図２（Ｂ）は実施例１の変更例２の説明図である。
　実施例１において、堰き止め板３１は、流入部８の底面から上方に起立する板状の構成を例示したがこれに限定されない。例えば、図２（Ａ）、（Ｂ）に示すように、堰き止め板３１′，３１″の上端部に、上下方向に対して傾斜する返し部３１ａ′，３１ａ″を設けることも可能である。図２（Ａ）に示すように、上方に行くにつれてガスの流れ方向の上流側に傾斜する返し部３１ａ′とすることも可能であるし、図２（Ｂ）に示すように、上方に行くにつれてガスの流れ方向の下流側に傾斜する返し部３１ａ″とすることも可能である。返し部３１ａ′，３１ａ″とすることで、堰き止め板３１でのガスの流れの乱れ、すなわち、堰き止め板３１の流路抵抗を抑制することが可能である。図２（Ａ）、（Ｂ）のいずれの返し部３１ａ′，３１ａ″が流路抵抗の抑制効果が高いかは、流速や流路上流部７の形状（直線状や湾曲を有する等）や流入部８の形状（水平向きや水平に対して傾斜している等）の流路の条件に応じて異なるため、設計等に応じて任意に変更可能である。なお、実施例１のように流路上流部７が直管状で流入部８が水平向きの場合は、図２（Ｂ）に示す構成の方が、堰き止め板３１の上端の下流側で排ガスの流れに渦ができにくくなるため、好ましい。 (Example of modification of Example 1)
2A and 2B are explanatory views of a modified example of the first embodiment, FIG. 2A is an explanatory diagram of the modified example 1 of the first embodiment, and FIG. 2B is an explanatory diagram of the modified example 2 of the first embodiment. ..
In the first embodiment, the damming plate 31 exemplifies a plate-like structure that stands upward from the bottom surface of the inflow portion 8, but is not limited thereto. For example, as shown in FIGS. 2A and 2B, it is also possible to provide a return portion 31a ′, 31a ″ inclined in the vertical direction at the upper end portion of the damming plate 31 ′, 31 ″. .. As shown in FIG. 2 (A), it is also possible to have a return portion 31a ′ that inclines toward the upstream side in the gas flow direction as it goes upward, and as shown in FIG. 2 (B), it goes upward. It is also possible to form a return portion 31a ″ that inclines toward the downstream side in the gas flow direction as the gas flows. It is possible to suppress the flow path resistance of the stop plate 31. Which of the return portions 31a'and 31a "in FIGS. 2A and 2B has a high effect of suppressing the flow path resistance depends on the flow velocity and the shape of the flow path upstream portion 7 (having a linear shape or a curve, etc.). Since the shape of the inflow portion 8 (horizontally oriented, inclined with respect to the horizontal, etc.) differs depending on the conditions of the flow path, it can be arbitrarily changed according to the design or the like. When the upstream portion 7 of the flow path is a straight tube and the inflow portion 8 is oriented horizontally, the configuration shown in FIG. 2B makes it difficult for a vortex to form in the flow of exhaust gas on the downstream side of the upper end of the dam 31. Therefore, it is preferable.
　図３は本発明の実施例２の脱硫装置の説明図である。
　次に本発明の実施例２の説明をするが、この実施例２の説明において、前記実施例１の構成要素に対応する構成要素には同一の符号を付して、その詳細な説明は省略する。
　この実施例２は下記の点で、前記実施例１と相違しているが、他の点では前記実施例１と同様に構成される。 FIG. 3 is an explanatory diagram of the desulfurization apparatus according to the second embodiment of the present invention.
Next, a second embodiment of the present invention will be described. In the second embodiment, the components corresponding to the components of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. do.
This Example 2 differs from the above-mentioned Example 1 in the following points, but is configured in the same manner as the above-mentioned Example 1 in other respects.
　図３において、実施例２の脱硫装置１では、堰き止め板３１は、流入部８の底面８ｂに対して出没可能に構成されている。実施例２の堰き止め板３１は、底面８ｂに対して突出する突出位置（堰き止め位置、図３の実線参照）と、底面８ｂに対して埋没する埋没位置（待機位置、図３の破線参照）との間を移動可能に構成されている。なお、実施例２の堰き止め板３１の出没は、制御部の一例としての演算器４１で制御される。
　また、実施例２の脱硫装置１では、流路上流部７において、蓄熱体２２（２２ａ）の上方と下方には、それぞれ、圧力計ＳＮ１，ＳＮ２が配置されている。各圧力計ＳＮ１，ＳＮ２で計測された値は、演算器４１に入力される。実施例２では、一例として、各圧力計ＳＮ１，ＳＮ２で計測された圧力の差圧ΔＰが演算器４１に入力される。 In FIG. 3, in the desulfurization apparatus 1 of the second embodiment, the damming plate 31 is configured to be able to appear and disappear with respect to the bottom surface 8b of the inflow portion 8. The damming plate 31 of the second embodiment has a protruding position protruding with respect to the bottom surface 8b (the damming position, see the solid line in FIG. 3) and a buried position buried with respect to the bottom surface 8b (standby position, see the broken line in FIG. 3). ) Is configured to be movable. The appearance and appearance of the dam 31 of the second embodiment is controlled by the arithmetic unit 41 as an example of the control unit.
Further, in the desulfurization apparatus 1 of the second embodiment, pressure gauges SN1 and SN2 are arranged above and below the heat storage body 22 (22a) in the upstream portion 7 of the flow path, respectively. The values measured by the pressure gauges SN1 and SN2 are input to the arithmetic unit 41. In the second embodiment, as an example, the differential pressure ΔP of the pressure measured by the pressure gauges SN1 and SN2 is input to the calculator 41.
　実施例２の洗浄液排出管２８には、水封部材の一例としてのダンパ４２が配置されている。ダンパ４２は、洗浄液排出管２８を開放／閉止して、洗浄液を排水／排水停止する。
　実施例２のダンパ４２の開閉は、演算器４１で制御される。なお、水封部材として、実施例２ではダンパ４２を例示したがこれに限定されない。例えば、バルブ（開閉弁）を使用することも可能である。
　図３において、実施例２の洗浄水ピット２９には、洗浄液のｐＨを計測するｐＨ計ＳＮ３や、洗浄液の量（水位）を計測する液量計ＳＮ４が設置されている。また、洗浄水ピット２９には、洗浄水ピット２９から排水するための排水管４６と、洗浄水ピット２９の洗浄水を循環させるための循環管４７とが接続されている。排水管４６は、排水弁４６ａで開閉され、排水管４６を通じた排水／排水停止が行われる。なお、排水弁４６ａは演算器４１で制御される。 A damper 42 as an example of the water sealing member is arranged in the cleaning liquid discharge pipe 28 of the second embodiment. The damper 42 opens / closes the cleaning liquid discharge pipe 28 to drain / stop the cleaning liquid.
The opening and closing of the damper 42 of the second embodiment is controlled by the arithmetic unit 41. Although the damper 42 is exemplified in Example 2 as the water sealing member, the present invention is not limited to this. For example, it is also possible to use a valve (on-off valve).
In FIG. 3, in the washing water pit 29 of the second embodiment, a pH meter SN3 for measuring the pH of the washing liquid and a liquid meter SN4 for measuring the amount (water level) of the washing liquid are installed. Further, the washing water pit 29 is connected to a drain pipe 46 for draining from the washing water pit 29 and a circulation pipe 47 for circulating the washing water in the washing water pit 29. The drain pipe 46 is opened and closed by the drain valve 46a, and drainage / drainage stop is performed through the drain pipe 46. The drain valve 46a is controlled by the arithmetic unit 41.
　循環管４７の他端は、洗浄水パイプ２７に合流している。循環管４７には洗浄液を移送する洗浄液ポンプ４８が設置されている。前記循環管４７や洗浄液ポンプ４８により、実施例２の循環部４７，４８が構成されている。したがって、洗浄液ポンプ４８が作動すると、洗浄水ピット２９の洗浄液が洗浄スプレ２６に送られてＧＧＨ２１に噴射される。また、洗浄水ピット２９の洗浄液が使用されない場合は、洗浄水パイプ２７の洗浄水弁４９が開放されて新規の洗浄液が供給される。なお、実施例２の洗浄液ポンプ４８や洗浄水弁４９は演算器４１で制御される。 The other end of the circulation pipe 47 joins the washing water pipe 27. A cleaning liquid pump 48 for transferring the cleaning liquid is installed in the circulation pipe 47. The circulation pipe 47 and the cleaning liquid pump 48 constitute the circulation portions 47 and 48 of the second embodiment. Therefore, when the cleaning liquid pump 48 operates, the cleaning liquid in the cleaning water pit 29 is sent to the cleaning spray 26 and injected into the GGH 21. When the cleaning liquid in the cleaning water pit 29 is not used, the cleaning water valve 49 of the cleaning water pipe 27 is opened and a new cleaning liquid is supplied. The cleaning liquid pump 48 and the cleaning water valve 49 of the second embodiment are controlled by the arithmetic unit 41.
（実施例２の制御部（演算器４１）の説明）
　実施例２の脱硫装置１の演算器４１は、外部との信号の入出力等を行う入出力インターフェースＩ／Ｏを有する。また、演算器４１は、必要な処理を行うためのプログラムおよび情報等が記憶されたＲＯＭ：リードオンリーメモリを有する。また、演算器４１は、必要なデータを一時的に記憶するためのＲＡＭ：ランダムアクセスメモリを有する。また、演算器４１は、ＲＯＭ等に記憶されたプログラムに応じた処理を行うＣＰＵ：中央演算処理装置を有する。したがって、実施例２の演算器４１は、情報処理装置、いわゆるコンピュータ装置により構成されている。よって、演算器４１は、ＲＯＭ等に記憶されたプログラムを実行することにより種々の機能を実現することができる。 (Explanation of Control Unit (Calculator 41) of Example 2)
The arithmetic unit 41 of the desulfurization apparatus 1 of the second embodiment has an input / output interface I / O for inputting / outputting signals to / from the outside. Further, the arithmetic unit 41 has a ROM: read-only memory in which a program, information, and the like for performing necessary processing are stored. Further, the arithmetic unit 41 has a RAM: random access memory for temporarily storing necessary data. Further, the arithmetic unit 41 has a CPU: a central processing unit that performs processing according to a program stored in a ROM or the like. Therefore, the arithmetic unit 41 of the second embodiment is composed of an information processing device, a so-called computer device. Therefore, the arithmetic unit 41 can realize various functions by executing the program stored in the ROM or the like.
　演算器４１は、圧力計ＳＮ１，ＳＮ２やｐＨ計ＳＮ３、液量計ＳＮ４等からの入力信号に応じて、堰き止め板３１やダンパ４２、排水弁４６ａ、洗浄液ポンプ４８、洗浄水弁４９等の制御が行われる。
　実施例２の演算器４１は、圧力計ＳＮ１，ＳＮ２の差圧ΔＰが予め定めれた閾値に達すると、蓄熱体２２に石炭燃焼灰等が蓄積して排ガスが流れにくくなっていると判断し、ＧＧＨ２１を洗浄する時期になったと判別する。演算器４１は、ＧＧＨ２１を洗浄する時期になったと判別した場合には、作業者にその旨を画像表示や音声案内等の報知方法で報知する。なお、作業者は、報知を受けると、ボイラの稼働状況に応じて計画的にボイラを停止して、洗浄作業に入ることとなる。 The arithmetic unit 41 includes a damming plate 31, a damper 42, a drain valve 46a, a cleaning liquid pump 48, a cleaning water valve 49, etc., in response to input signals from the pressure meters SN1 and SN2, the pH meter SN3, the liquid meter SN4, and the like. Control is done.
When the differential pressure ΔP of the pressure gauges SN1 and SN2 reaches a predetermined threshold value, the arithmetic unit 41 of the second embodiment determines that coal combustion ash and the like are accumulated in the heat storage body 22 and the exhaust gas is difficult to flow. , It is determined that it is time to wash the GGH21. When the calculator 41 determines that it is time to clean the GGH 21, it notifies the operator to that effect by a notification method such as image display or voice guidance. Upon receiving the notification, the worker will systematically stop the boiler according to the operating status of the boiler and start the cleaning work.
　実施例２の演算器４１は、ＧＧＨ２１の洗浄作業が開始された場合には、堰き止め板３１を埋没位置から突出位置に移動させる。なお、洗浄が終了すると、演算器４１は、堰き止め板３１を突出位置から埋没位置に移動させる。
　また、実施例２の演算器４１は、ＧＧＨ２１の洗浄作業が開始された場合には、ダンパ４２を作動させて、洗浄液排出管２８を開放する。
　さらに、演算器４１は、ＧＧＨ２１の洗浄作業が開始された場合には、ｐＨ計ＳＮ３の検知結果に基づいて、洗浄水ピット２９の洗浄液のｐＨが所定の値の範囲内であれば、洗浄水ピット２９の洗浄液を循環して洗浄を行うように制御する。この場合、洗浄液ポンプ４８を作動させるとともに、洗浄水弁４９は閉止した状態で保持する。したがって、洗浄水ピット２９の洗浄液が使用されて、ＧＧＨ２１の洗浄が行われる。
　一方、洗浄水ピット２９の洗浄液のｐＨが所定の値の範囲外であれば、演算器４１は、洗浄水ピット２９の洗浄液を循環させずに洗浄を行うように制御する。この場合、洗浄液ポンプ４８を停止させるとともに、洗浄水弁４９を開放する。したがって、新たな洗浄液が供給されて、ＧＧＨ２１の洗浄が行われる。 When the cleaning work of the GGH 21 is started, the arithmetic unit 41 of the second embodiment moves the damming plate 31 from the buried position to the protruding position. When the cleaning is completed, the arithmetic unit 41 moves the damming plate 31 from the protruding position to the buried position.
Further, when the cleaning work of the GGH 21 is started, the arithmetic unit 41 of the second embodiment operates the damper 42 to open the cleaning liquid discharge pipe 28.
Further, when the cleaning work of the GGH 21 is started, the arithmetic unit 41 will use the cleaning water if the pH of the cleaning liquid in the cleaning water pit 29 is within a predetermined value based on the detection result of the pH meter SN3. The cleaning liquid in the pit 29 is circulated and controlled to perform cleaning. In this case, the cleaning liquid pump 48 is operated and the cleaning water valve 49 is held in a closed state. Therefore, the cleaning liquid in the cleaning water pit 29 is used to clean the GGH 21.
On the other hand, if the pH of the cleaning liquid in the cleaning water pit 29 is out of the predetermined value range, the arithmetic unit 41 controls to perform cleaning without circulating the cleaning liquid in the cleaning water pit 29. In this case, the cleaning liquid pump 48 is stopped and the cleaning water valve 49 is opened. Therefore, a new cleaning liquid is supplied to clean the GGH21.
　また、演算器４１は、液量計ＳＮ４の検知結果に基づいて、排水弁４６ａやダンパ４２を制御する。実施例２の演算器４１は、液量計ＳＮ４の検知結果から、洗浄水ピット２９の洗浄液の液量が予め定められた上限量に達する場合には、排水弁４６ａを開放して、洗浄水ピット２９の洗浄液が溢れないように制御する。なお、液量が上限量に達しない場合には、排水弁４６ａを閉止する。
　さらに、実施例２の演算器４１は、液量計ＳＮ４の検知結果から、洗浄作業が行われていない状況で、洗浄水ピット２９の洗浄液の液量が予め定められた下限量を下回る場合には、ダンパ４２を作動させて洗浄液排出管２８を閉止するように制御する。 Further, the arithmetic unit 41 controls the drain valve 46a and the damper 42 based on the detection result of the liquid level meter SN4. When the liquid amount of the washing liquid in the washing water pit 29 reaches a predetermined upper limit from the detection result of the liquid amount meter SN4, the arithmetic unit 41 of the second embodiment opens the drain valve 46a to wash water. Control so that the cleaning liquid in the pit 29 does not overflow. If the amount of liquid does not reach the upper limit, the drain valve 46a is closed.
Further, in the arithmetic unit 41 of the second embodiment, when the amount of the cleaning liquid in the cleaning water pit 29 is lower than the predetermined lower limit amount in the situation where the cleaning work is not performed from the detection result of the liquid amount meter SN4. Controls to operate the damper 42 to close the cleaning liquid discharge pipe 28.
（実施例２の作用）
　前記構成を備えた実施例２の脱硫装置１では、差圧ΔＰが所定の値に達すると洗浄する時期になったものと判別し、作業者に報知する。したがって、ＧＧＨ２１の洗浄が必要かどうか、すなわち、ＧＧＨ２１がどのくらい汚れているのかを自動的に判別することができる。
　そして、洗浄作業が開始されると、洗浄水ピット２９の洗浄液のｐＨが所定の範囲内であれば、洗浄液があまり汚れておらず、洗浄に使用することが可能と判断して、洗浄液を循環させて噴射する。したがって、循環させない場合に比べて、水の使用量を削減でき、環境負荷を軽減でき、費用も抑制できる。一方、洗浄液のｐＨが所定の範囲外であれば、洗浄液が汚れていて洗浄に使用することが不適当であると判断して、洗浄水ピット２９の洗浄液を排水しつつ、新規の洗浄液を噴射する。 (Action of Example 2)
In the desulfurization apparatus 1 of the second embodiment having the above configuration, when the differential pressure ΔP reaches a predetermined value, it is determined that it is time to wash, and the operator is notified. Therefore, it is possible to automatically determine whether or not the GGH21 needs to be cleaned, that is, how dirty the GGH21 is.
Then, when the cleaning work is started, if the pH of the cleaning liquid in the cleaning water pit 29 is within a predetermined range, it is determined that the cleaning liquid is not very dirty and can be used for cleaning, and the cleaning liquid is circulated. Let it spray. Therefore, the amount of water used can be reduced, the environmental load can be reduced, and the cost can be suppressed as compared with the case where the water is not circulated. On the other hand, if the pH of the cleaning liquid is out of the predetermined range, it is determined that the cleaning liquid is dirty and inappropriate for use in cleaning, and a new cleaning liquid is sprayed while draining the cleaning liquid in the cleaning water pit 29. do.
　また、実施例２では、洗浄作業が開始されると堰き止め板３１が突出位置に移動して、洗浄液が収容部３に流入することを抑制するとともに、洗浄作業が行われていない状況、すなわち、ボイラが稼働している状況では、堰き止め板３１が流入部８の内部に突出しない。よって、ボイラ稼働中（脱硫中）に、堰き止め板３１が排ガスの流れを乱すことを防止できる。
　さらに、実施例２では、洗浄作業が行われていない状況、例えば、ボイラ稼働中に、洗浄水ピット２９の洗浄液の液量が少なくなるとダンパ４２が洗浄液排出管２８を閉止する。洗浄水ピット２９の洗浄液の液量が少なくなって、洗浄液排出管２８の内部の洗浄液が存在しなくなると、流路上流部７を流れる排ガスの一部が洗浄液排出管２８を流れ、排ガス流路９の外部に漏れ出す恐れがある。これに対して、実施例２では、洗浄液排出管２８から洗浄液がなくなる前に、ダンパ４２が洗浄液排出管２８を閉止すると、ダンパ４２よりも上方に洗浄液が残った状態となる。すなわち、水封された状態となる。よって、排ガスが排ガス流路９の外部に漏れ出すことを抑制できる。なお、水封する構成を設けることが望ましいが、洗浄水ピット２９の液量がほぼ一定になるように制御される等であれば、水封の構成は設けないことも可能である。 Further, in the second embodiment, when the cleaning work is started, the damming plate 31 moves to the protruding position to prevent the cleaning liquid from flowing into the accommodating portion 3, and the cleaning work is not performed, that is, In the situation where the boiler is operating, the dam 31 does not protrude into the inflow portion 8. Therefore, it is possible to prevent the dam 31 from disturbing the flow of exhaust gas while the boiler is in operation (during desulfurization).
Further, in the second embodiment, when the cleaning work is not performed, for example, when the amount of the cleaning liquid in the cleaning water pit 29 becomes small during the operation of the boiler, the damper 42 closes the cleaning liquid discharge pipe 28. When the amount of the cleaning liquid in the cleaning water pit 29 becomes small and the cleaning liquid inside the cleaning liquid discharge pipe 28 does not exist, a part of the exhaust gas flowing in the upstream portion 7 of the flow path flows through the cleaning liquid discharge pipe 28, and the exhaust gas flow path. There is a risk of leaking to the outside of 9. On the other hand, in Example 2, if the damper 42 closes the cleaning liquid discharge pipe 28 before the cleaning liquid is exhausted from the cleaning liquid discharge pipe 28, the cleaning liquid remains above the damper 42. That is, it is in a water-sealed state. Therefore, it is possible to prevent the exhaust gas from leaking to the outside of the exhaust gas flow path 9. Although it is desirable to provide a water-sealing configuration, it is possible not to provide a water-sealing configuration as long as the amount of liquid in the washing water pit 29 is controlled to be substantially constant.
（変更例）
　以上、本発明の実施例および変更例を詳述したが、本発明は、前記実施例および変更例に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲で、種々の変更を行うことが可能である。本発明のその他の変更例（Ｈ01）～（Ｈ05）を下記に例示する。
（Ｈ01）前記実施例において、熱交換器として回転式のＧＧＨ２１を例示したがこれに限定されない。例えば、回転せず、流路上流部７と流路下流部４に配置された伝熱管の中を熱媒が循環する熱交換器にも適用可能である。 (Change example)
Although the examples and modifications of the present invention have been described in detail above, the present invention is not limited to the above-mentioned examples and modifications, but is within the scope of the gist of the present invention described in the claims. It is possible to make various changes. Examples of other modifications (H01) to (H05) of the present invention are shown below.
(H01) In the above embodiment, the rotary GGH21 is exemplified as the heat exchanger, but the present invention is not limited thereto. For example, it can be applied to a heat exchanger in which a heat medium circulates in a heat transfer tube arranged in a flow path upstream portion 7 and a flow path downstream portion 4 without rotating.
（Ｈ02）前記実施例１の変更例において、返し部３１ａ′，３１ａ″の形状は、例示した形状に限定されず、弧状に湾曲した形状や多角柱状等、任意の形状に変更可能である。
（Ｈ03）前記実施例において、堰き止め板３１の設置位置や大きさ等は、実施例で例示した位置に限定されない。例えば、設置位置は、実施例で例示した位置よりも、より収容部３に近い側に配置したり、洗浄液排出管２８に近い側に配置することも可能である。また、実施例２のように出没可能な構成の場合、突出位置では流入部８を完全に塞ぐ大きさとすることも可能である。 (H02) In the modified example of the first embodiment, the shape of the return portion 31a', 31a "is not limited to the exemplified shape, and can be changed to an arbitrary shape such as an arc-shaped curved shape or a polygonal columnar shape.
(H03) In the above embodiment, the installation position, size, and the like of the damming plate 31 are not limited to the positions exemplified in the embodiment. For example, the installation position may be arranged closer to the accommodating portion 3 or closer to the cleaning liquid discharge pipe 28 than the position illustrated in the embodiment. Further, in the case of a configuration that can appear and disappear as in the second embodiment, it is possible to make the inflow portion 8 completely closed at the protruding position.
（Ｈ04）前記実施例において、差圧ΔＰに基づいて洗浄する時期の判別を行う構成を例示したがこれに限定されない。例えば、流路上流部７の排ガスの温度と流路下流部４を流れる排ガスの温度から伝熱性能の低下を判別して、洗浄する時期の判別を行うことも可能である。他にも、前回の洗浄作業からの累積の稼働時間や、ＧＧＨ２１の累積の回転回数から洗浄する時期の判別を行うことも可能である。
（Ｈ05）前記実施例において、洗浄液のｐＨに基づいて循環させるかどうかの判別を行う場合を例示したがこれに限定されない。例えば、循環回数や循環させた液量が多くなると洗浄液が汚れていると判別して循環させなくすることも可能である。他にも、例えば、洗浄直後に洗浄水ピット２９に流れ込む洗浄液に石炭燃焼灰等が多く含まれ（汚れがひどく）、洗浄開始から時間が経過すると流れ込む洗浄液に含まれる石炭燃焼灰等が少なくなることから、洗浄開始から所定の数分間は、流れ込む洗浄液を排出して、それ以降は、洗浄水ピット２９に洗浄液を送って、循環して使用するといった制御も可能である。 (H04) In the above embodiment, a configuration for determining the cleaning time based on the differential pressure ΔP has been exemplified, but the present invention is not limited to this. For example, it is also possible to determine the deterioration of the heat transfer performance from the temperature of the exhaust gas in the upstream portion 7 of the flow path and the temperature of the exhaust gas flowing in the downstream portion 4 of the flow path, and determine the cleaning time. In addition, it is also possible to determine the cleaning time from the cumulative operating time from the previous cleaning operation and the cumulative number of rotations of the GGH21.
(H05) In the above embodiment, the case of determining whether or not to circulate based on the pH of the washing liquid has been exemplified, but the present invention is not limited to this. For example, when the number of circulations or the amount of the circulated liquid increases, it is possible to determine that the cleaning liquid is dirty and prevent the circulation. In addition, for example, the cleaning liquid that flows into the cleaning water pit 29 immediately after cleaning contains a large amount of coal combustion ash (severely dirty), and the amount of coal combustion ash and the like contained in the cleaning liquid that flows in after a lapse of time from the start of cleaning decreases. Therefore, it is possible to control that the washing liquid that flows in is discharged for a predetermined few minutes from the start of washing, and after that, the washing liquid is sent to the washing water pit 29 and circulated for use.
１…脱硫装置、
３…収容部、
４…流路下流部、
７…流路上流部、
８…流入部、
８ａ…境界、
８ｂ…排ガス流路の底面、
９…排ガス流路、
１１…噴射器、
２１…熱交換器、
２３…回転軸、
２６…洗浄機、
２８…排出部、
３１…規制部材、
３１ａ′，３１ａ″…返し部、
４１…制御部、
４２…水封部材、
４７，４８…循環部。 1 ... Desulfurization equipment,
3 ... Containment section,
4 ... Downstream of the flow path,
7 ... upstream part of the flow path,
8 ... Inflow part,
8a ... Boundary,
8b ... The bottom of the exhaust gas flow path,
9 ... Exhaust gas flow path,
11 ... Injector,
21 ... Heat exchanger,
23 ... Rotation axis,
26 ... Washing machine,
28 ... Discharge section,
31 ... Regulatory member,
31a', 31a "... Return part,
41 ... Control unit,
42 ... Water sealing member,
47, 48 ... Circulation part.

Claims (11)

  1. 　排ガス中の硫黄分を吸収する吸収液が収容される収容部から上方に延びる流路下流部と、前記収容部よりも上方で前記流路下流部に接続されて排ガスが流入する流入部と、前記流入部の上流側に接続された流路上流部と、を有する排ガス流路と、
    　前記流路下流部の排ガスに前記吸収液を噴射する噴射器と、
    　前記流路上流部の排ガスから熱を回収すると共に、排ガスの流れ方向に対して前記噴射器よりも下流側の排ガスに回収した熱で加熱する熱交換器と、
    　前記流路上流部に配置されて前記熱交換器に洗浄液を噴射する洗浄機と、
    　前記流路上流部の底部に設けられて、洗浄液を排出する排出部と、
    　ガスの流れ方向に対して、前記排出部よりも下流側且つ前記流入部と前記流路下流部との境界の位置よりも上流側に配置され、前記洗浄液の前記流路下流部への流入を規制する規制部材と、
    　を備えたことを特徴とする脱硫装置。     A downstream portion of the flow path extending upward from the accommodating portion in which the absorbing liquid that absorbs sulfur in the exhaust gas is accommodated, and an inflow portion connected to the downstream portion of the flow path above the accommodating portion and into which the exhaust gas flows. An exhaust gas flow path having a flow path upstream portion connected to the upstream side of the inflow portion, and an exhaust gas flow path.
    An injector that injects the absorption liquid into the exhaust gas downstream of the flow path,
    A heat exchanger that recovers heat from the exhaust gas upstream of the flow path and heats the exhaust gas downstream of the injector in the flow direction of the exhaust gas.
    A cleaning machine located upstream of the flow path and injecting cleaning liquid onto the heat exchanger.
    A discharge section provided at the bottom of the upstream portion of the flow path to discharge the cleaning liquid, and a discharge section.
    It is arranged on the downstream side of the discharge portion and upstream of the position of the boundary between the inflow portion and the downstream portion of the flow path with respect to the gas flow direction, and causes the inflow of the cleaning liquid into the downstream portion of the flow path. Regulatory members to regulate and
    A desulfurization device characterized by being equipped with.
  2. 　前記規制部材の重力方向の上端部に形成され、重力方向に対して傾斜する返し部、
    　を備えたことを特徴とする請求項１に記載の脱硫装置。     A barb formed at the upper end of the restricting member in the direction of gravity and inclined with respect to the direction of gravity,
    The desulfurization apparatus according to claim 1, wherein the desulfurization apparatus is provided.
  3. 　重力方向の上方に行くにつれてガスの流れ方向の下流側に傾斜する前記返し部、
    　を備えたことを特徴とする請求項２に記載の脱硫装置。     The return portion, which inclines to the downstream side in the gas flow direction as it goes upward in the direction of gravity,
    The desulfurization apparatus according to claim 2, wherein the desulfurization apparatus is provided.
  4. 　前記排ガス流路の底面に対して出没可能な前記規制部材、
    　を備えたことを特徴とする請求項１ないし３のいずれかに記載の脱硫装置。     The regulating member, which can appear and disappear with respect to the bottom surface of the exhaust gas flow path,
    The desulfurization apparatus according to any one of claims 1 to 3, wherein the desulfurization apparatus is provided.
  5. 　前記洗浄機が洗浄液を噴射する洗浄作業が行われる場合に、前記排ガス流路の底面に対して突出し、前記洗浄作業が終了すると前記排ガス流路の底面に対して埋没する前記規制部材、
    　を備えたことを特徴とする請求項４に記載の脱硫装置。     The restricting member, which protrudes from the bottom surface of the exhaust gas flow path when the cleaning machine sprays the cleaning liquid and is buried in the bottom surface of the exhaust gas flow path when the cleaning operation is completed.
    The desulfurization apparatus according to claim 4, wherein the desulfurization apparatus is provided.
  6. 　熱を蓄積可能且つ回転軸を中心として回転可能に構成され、前記流路上流部の内部と前記流路下流部の内部とを順に通過する前記熱交換器、
    　を備えたことを特徴とする請求項１ないし５のいずれかに記載の脱硫装置。     The heat exchanger, which is configured to be able to store heat and rotate around a rotation axis, and passes through the inside of the upstream portion of the flow path and the inside of the downstream portion of the flow path in order.
    The desulfurization apparatus according to any one of claims 1 to 5, wherein the desulfurization apparatus is provided.
  7. 　前記流路上流部における前記熱交換器の排ガスの流れ方向の上流側と下流側との圧力の差に基づいて、前記洗浄機を噴射する時期を制御する制御部、
    　を備えたことを特徴とする請求項１ないし６のいずれかに記載の脱硫装置。     A control unit that controls the timing of injecting the washing machine based on the difference in pressure between the upstream side and the downstream side in the flow direction of the exhaust gas of the heat exchanger in the upstream portion of the flow path.
    The desulfurization apparatus according to any one of claims 1 to 6, wherein the desulfurization apparatus is provided.
  8. 　前記排出部から排出された洗浄液を前記洗浄機に循環させる循環部、
    　を備えたことを特徴とする請求項１ないし７のいずれかに記載の脱硫装置。     A circulation unit that circulates the cleaning liquid discharged from the discharge unit to the cleaning machine.
    The desulfurization apparatus according to any one of claims 1 to 7, wherein the desulfurization apparatus is provided.
  9. 　前記排出部から排出された洗浄液のｐＨに基づいて、前記洗浄液を前記洗浄機に循環させるか否かを判別する制御部、
    　を備えたことを特徴とする請求項８に記載の脱硫装置。     A control unit that determines whether or not to circulate the cleaning liquid in the cleaning machine based on the pH of the cleaning liquid discharged from the discharging unit.
    The desulfurization apparatus according to claim 8, wherein the desulfurization apparatus is provided.
  10. 　前記排出部に設けられ、洗浄液の入口側を水封する水封部材、
    　を備えたことを特徴とする請求項１ないし９のいずれかに記載の脱硫装置。     A water-sealing member provided in the discharge section that water-seals the inlet side of the cleaning liquid.
    The desulfurization apparatus according to any one of claims 1 to 9, wherein the desulfurization apparatus is provided.
  11. 　前記排出部を閉止するダンパにより構成された前記水封部材、
    　を備えたことを特徴とする請求項１０に記載の脱硫装置。     The water-sealing member, which is composed of a damper that closes the discharge portion.
    The desulfurization apparatus according to claim 10, wherein the desulfurization apparatus is provided.
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