JP5295403B2 - Marine exhaust gas denitration reactor and exhaust gas denitration equipment - Google Patents

Description

  The present invention includes an evaporation chamber for blowing urea water or ammonia water into exhaust gas discharged from a diesel engine mounted on a ship, and a reaction chamber having a catalyst unit for removing nitrogen oxides in contact with the exhaust gas. The present invention relates to a marine exhaust gas denitration reaction vessel and a marine exhaust gas denitration facility.

  In a denitration apparatus using catalytic reduction (SCR) for removing nitrogen oxides (hereinafter referred to as NOx) in exhaust gas discharged from an internal combustion engine, an apparatus using urea water as a reducing agent is proposed in Patent Document 1 and the like. Has been.

  The ship is equipped with a large diesel engine, but because of the limited volume for exhaust gas treatment, an evaporation chamber that blows urea water or ammonia water as a reducing agent for denitration, and NOx removal for effective use of space A denitration reactor in which a reaction chamber in which a catalyst element carrying a denitration catalyst is placed in one reaction vessel is conceivable.

JP2011-144765A

  By the way, there is a movement to implement regulations in some sea areas that significantly reduce nitrogen oxides in exhaust gas discharged from diesel engines from the current regulations. When navigating between such NOx-regulated sea areas and NOx-unregulated sea areas, it is not necessary to introduce exhaust gas into the reaction chamber in the NOx-unregulated sea areas. For this reason, when the evaporation chamber and the reaction chamber are installed in one reaction vessel, there is a risk that the components of the reaction vessel may be damaged due to thermal distortion caused by the difference in thermal expansion due to the temperature difference between the evaporation chamber and the reaction chamber. It was.

  The present invention solves the above-mentioned problems and effectively absorbs the thermal expansion difference due to the temperature difference between the evaporation chamber and the reaction chamber provided in the denitration reactor, thereby preventing damage due to thermal distortion. It aims at providing the exhaust gas denitration equipment for containers and ships.

The invention described in claim 1
A vessel provided with a reaction chamber provided with an evaporation chamber for blowing urea water or ammonia water into exhaust gas and a catalyst unit for contacting the exhaust gas into which urea water or ammonia water is blown, in a cylindrical reaction vessel An exhaust gas denitration reaction vessel,
In the container body, provided with an evaporation chamber and a reaction chamber partitioned by a partition along the container axial direction, and provided with an untreated gas outlet in the evaporator,
The partition wall is a thermal expansion absorption structure capable of absorbing the difference in thermal expansion between the constituent members of the evaporation chamber and the reaction chamber by expanding and contracting in the direction along the container axis and the cross section of the container,
The thermal expansion absorption structure is
A constant gap is formed between the main partition plate attached to the evaporation chamber side and the main partition plate attached to the reaction chamber side on the partition wall base material along the container axial direction on the inner surface of the shell of the container body. And a sub-partition plate to which the catalyst unit is attached, and a double wall structure, and a predetermined range in the container axial direction between the partition base material and the main partition plate and the sub-partition plate. It is equipped with an axial direction slide mechanism that is freely movable at
Further, at the front and rear end portions of the sub partition plate in the exhaust gas flow direction, heat between the sub partition plate and the main partition plate in the container axial direction of the sub partition plate and the main partition plate and in the direction along the cross section of the container. A movable seal portion capable of following displacement due to expansion is provided.

The invention according to claim 2 is the configuration according to claim 1,
The axial direction slide mechanism includes a main partition plate and a sub-partition plate, a guide portion formed on one side of the partition base material in the container axial direction, and a cover formed on the other and slidably engaged with the guide portion. And a guide member.

The invention according to claim 3 is the configuration according to claim 1 or 2,
The movable seal portion is provided with an elastic seal plate whose fixed end is attached to one of the end portions of the main partition plate and the sub partition plate and whose free end side is in sliding contact with the other.

The invention according to claim 4
A marine exhaust gas denitration reaction vessel according to any one of claims 1 to 3,
An exhaust gas supercharger that supplies exhaust gas from the reaction chamber to the intake port via a denitration gas discharge pipe;
A bypass pipe connecting the air supply port of the exhaust gas supercharger and the untreated gas outlet of the evaporation chamber;
An exhaust gas switching valve capable of opening and closing the bypass pipe;
An exhaust gas on-off valve capable of opening and closing the denitration gas discharge pipe interposed at least in the denitration gas discharge pipe,
The evaporating chamber is also used as a manifold for joining exhaust gases discharged from a plurality of diesel engines and supplying the exhaust gas to the exhaust gas supercharger.

  According to the first aspect of the present invention, the reaction chamber is integrally provided with the evaporation chamber and the reaction chamber partitioned by the partition, and the main partition plate and the sub partition plate are provided in the thermal expansion absorption structure provided in the partition. A double wall structure with a certain gap is provided to absorb expansion and contraction in the direction along the transverse cross section of the container, and an axial direction sliding mechanism is attached to the partition base, the main partition plate and the sub partition plate. Can be provided to absorb expansion and contraction in the container axial direction. Therefore, when the exhaust gas in the evaporation chamber is discharged from the untreated exhaust gas outlet and the exhaust gas is not introduced into the reaction chamber, the thermal expansion of the partition wall even if the evaporation chamber is hot and the reaction chamber is cold Expansion and contraction can be effectively absorbed by the absorption structure, and damage to the reaction vessel due to thermal distortion can be prevented in advance.

  According to the second aspect of the present invention, the axial direction sliding mechanism is constituted by the guide portion and the guided portion that is slidably engaged with the guide portion, so that the thermal expansion of the main partition plate and the sub partition plate is achieved. The expansion and contraction in the axial direction due to the difference can be effectively absorbed.

  According to the invention of claim 3, since the elastic seal plate is provided between the sub partition plate and the main partition plate at the front and rear end portions of the sub partition plate, the container axial direction of the sub partition plate and the main partition plate and Corresponding to displacement due to thermal expansion in the direction along the cross section of the container, the elastic seal plate can be deformed and followed, and the gap between the main partition plate and the sub partition plate can be reliably sealed, and the exhaust gas Can be surely prevented.

  According to the fourth aspect of the present invention, when the exhaust gas is not denitrated in the NOx non-regulated sea area or the like, the exhaust gas switching valve is opened to connect the bypass pipe, and the gas cutoff valve is closed to connect the communication section or the denitration gas exhaust pipe. The exhaust gas discharged from a plurality of diesel engines and joined in the evaporation chamber can be introduced into the exhaust gas supercharger from the untreated exhaust port of the evaporation chamber through the bypass pipe. In this case, even if a temperature difference occurs between the evaporation chamber into which the exhaust gas is introduced and the reaction chamber into which the exhaust gas is not introduced, and expansion and contraction due to thermal expansion occurs between the main partition plate and the sub partition plate of the partition wall, The double wall structure, which is a part of the thermal expansion absorption structure, can absorb the expansion and contraction difference in the direction along the cross section of the partition wall container, and the axial slide that is the remainder of the thermal expansion absorption structure of the partition wall The mechanism can absorb the difference in expansion and contraction in the container axial direction. Therefore, it is possible to effectively absorb the thermal strain due to the temperature difference between the evaporation chamber and the reaction chamber, and to prevent the constituent members of the reaction vessel from being damaged by the thermal strain.

It is a block diagram which shows the Example of the exhaust gas denitration equipment for ships which concerns on this invention, and demonstrates the time of denitration. It is a block diagram explaining the exhaust gas denitration equipment for ships at the time of non-denitration. It is a cross-sectional view showing a marine exhaust gas denitration reaction vessel. It is a partial longitudinal cross-sectional view of an exhaust gas denitration reaction vessel. It is a perspective view of a denitration unit. It is a perspective view which shows an axial center direction slide mechanism. (A)-(c) is a perspective view which shows the other Example of an axial center direction sliding mechanism, respectively. It is a longitudinal cross-sectional view which shows a movable seal part. It is a longitudinal cross-sectional view which shows the other Example of a movable seal part. It is a side view which shows the outer periphery support tool of a unit aggregate. (A) And (b) shows the holder of a unit assembly, (a) shows a pressing tool, (b) shows a fixing tool. It is a fragmentary perspective view which shows a fixing tool. It is a cross-sectional view showing another embodiment of the exhaust gas denitration reaction vessel.

[Example]
Embodiments of the present invention will be described below with reference to the drawings.
(Ship exhaust gas denitration equipment)
FIG. 1 shows a configuration of a marine exhaust gas denitration facility for denitrating exhaust gas discharged from a combustion chamber of a marine diesel engine 13 according to the present invention, 11 is a denitration reactor, and 12 is exhaust gas of the diesel engine 13. It is an exhaust gas supercharger driven by. The vessel body 20 of the denitration reaction vessel 11 has an evaporation chamber 23 for blowing urea water (or ammonia water) into the exhaust gas at the lower portion and a flue gas in which urea water is blown at the upper portion by the partition wall 21 along the container axis O direction. A reaction chamber 25 for reducing NOx by bringing it into contact with a plurality of catalyst units 24 is partitioned, and the evaporation chamber 23 and the reaction chamber 25 are accommodated integrally.

  The container body 20 of the denitration reaction container 11 is formed in a pressure resistant container in which both ends of a cylindrical shell body 20B are closed by curved pressure-proof end plates 20R, 20L, for example. A plurality of exhaust gas inlets 26 for introducing exhaust gas from a plurality of combustion chambers (four chambers in the figure) in the diesel engine 13 to the evaporation chamber 23 are formed at the bottom of the shell 20B, and the evaporation chamber 23 joins the exhaust gas. Also used for exhaust gas manifold. Further, an untreated gas outlet 27 is formed near the lower part of one end plate 20L of the shell body 20B. Further, a denitration gas outlet 28 is formed in the vicinity of the upper portion of one end plate 20L of the shell 20B so as to face the reaction chamber 25 and discharge the denitration exhaust gas.

  The exhaust gas supercharger 12 includes a turbine unit 12T and a compressor unit 12C that are connected to each other via an input / output shaft. In the turbine section 12T, the untreated exhaust gas or the denitrated exhaust gas discharged from the combustion chamber of the diesel engine 13 is supplied to the intake port 12i through the denitration reaction vessel 11, and the exhaust gas discharged from the exhaust port 12o is discharged from the exhaust chimney. To do. The compressor unit 12 </ b> C sucks and pressurizes the atmosphere, and supplies the pressurized combustion air to the combustion chamber of the diesel engine 13.

  A denitration gas discharge pipe 14 is connected between the denitration gas outlet 28 of the denitration reaction vessel 11 and the air supply port 12i of the turbine section 12T. A bypass pipe 16 connected to the untreated gas outlet 27 of the denitration reaction vessel 11 is connected to the vicinity of the air inlet 12 i of the denitration gas discharge pipe 14. A denitration outlet valve (gas shutoff valve) 15 comprising a butterfly valve is provided on the denitration gas discharge pipe 14 upstream of the connecting portion, and the denitration gas discharge pipe 14 can be closed. Further, the bypass pipe 16 is provided with an exhaust gas switching valve 17 composed of a butterfly valve.

(Denitration reaction vessel)
A spray nozzle 22 that blows urea water or ammonia water into the exhaust gas in the evaporation chamber 23 is disposed on one end plate 20 </ b> L of the container body 20. A communication portion 30 is formed on the other end plate 20 </ b> R side of the container body 20. The communication portion 30 is attached between the partition wall 21 and the shell body 20B of the evaporation chamber 23 in a direction along the cross section of the container, and closes the evaporation chamber 23, and the partition wall 21 (partition wall 31). Between the first end plate 20R and the other end plate 20R, the evaporating chamber outlet valve (gas shut-off valve) 33 provided in the partition wall 31, the evaporating chamber 23 and the reaction chamber 25 at equal pressure. In order to adjust, it is comprised with the single or several pressure regulation opening 34 formed in the partition wall 31. FIG. Here, by removing the evaporation chamber outlet valve 33 to form an opening and closing the denitration outlet valve 15, all the exhaust gas is removed using the ventilation resistance of the reaction chamber 25 and the denitration gas discharge pipe 14. It can also introduce | transduce into the turbine part 12T of the exhaust gas supercharger 12 from the evaporation chamber 23. FIG. In this case, there is no pressure difference between the evaporation chamber 23 and the reaction chamber 25, so there is no need to form the pressure adjusting port 34.

(Reaction room)
As shown in FIGS. 3 and 4, in the reaction chamber 25, a plurality of catalyst units 24 are stacked in the vertical and horizontal directions between the partition wall 21 and the shell 20 </ b> B, and in the container axis O direction. The unit aggregate 41 is formed by being connected. For example, as shown in FIG. 5, the catalyst unit 24 is a unit assembly in which a catalyst element 43 having a honeycomb-shaped cross section is housed in a housing frame 42 in which a notched hole 42a is formed on the opposite side surface. As a cross-sectional form of 41, a rectangular or trapezoidal cross section as shown in FIG. 13 is adopted as the storage frame 42 other than the illustrated square cross section.

  This unit assembly 41 is supported in the shell 20B through a plurality of outer peripheral supports 44 whose intervals can be adjusted, and on one end side (downstream side of the exhaust gas flow), a fixing tool 45 and a shell body An outer peripheral closing plate 46 for closing the space between 20B and the unit assembly 41 is disposed, and a pressing tool 47 is disposed and held on the other end side (upstream side of the exhaust gas flow). In addition, the AA cross-section arrow line shown in FIG. 4 has shown the cross-sectional position of FIG.

  As shown in FIG. 10, the outer peripheral support tool 44 is cut by an inclined surface inclined at a predetermined angle with respect to the axis and is one of the tapered sleeves 44a and 44b slidable on the inclined surface. Is attached to the storage frame body 42 of the catalyst unit 24, and the other taper sleeve 44b is attached to the shell body 20B via a connecting member 44c. The sliding limit is regulated by the connecting bolts / nuts 44d loosely fitted in the shaft holes 44e, 44f of the tapered sleeves 44a, 44b, and the shell body is within the sliding limit of the tapered sleeves 44a, 44b by the connecting bolts / nuts 44d. The expansion / contraction difference due to the thermal expansion of 20B and the unit assembly 41 can be absorbed. Accordingly, the outer peripheral portion of the unit assembly 41 is supported by the outer peripheral support 44 between the shell 20B and the partition wall 21.

  The fixture 45 installed at the downstream end of the exhaust gas flow of the unit assembly 41 is a substantially grid-like plate-like frame 45a corresponding to the arrangement pattern of the catalyst units 24, as shown in FIGS. In this plate-like frame body 45a, the chamfered front end is brought into contact with the contact line between the adjacent catalyst units 24. And the outer peripheral edge part of the plate-shaped frame 45a is each connected and fixed to the trunk | drum 20B by the attachment member 45b, and the movement to the downstream of the waste gas of the unit assembly 41 is controlled. The outer periphery closing plate 46 is installed on the downstream side of the attachment member 45b to shield the exhaust gas. In addition, the outer edge part of the plate-shaped frame 45a is formed in the half cross-sectional shape.

  The presser 47 installed at the upstream end of the exhaust gas flow of the unit assembly 41 includes a substantially grid-like linear frame 47a corresponding to the arrangement pattern of the catalyst units 24, as shown in FIG. The linear frame 47a is formed in a rod shape having a circular cross section, and is fitted into a tapered groove formed in front of the contact portion between the adjacent catalyst units 24. A holding bolt 47c in the direction of the container axis O is fitted to a bracket 47b erected on the shell 20B, and is fixed in a pressurized state by a lock nut 47d, and is attached to the tip of the holding bolt 47c. The linear frame 47a is pressed against the catalyst unit 24 via the pressing plate 47e, and the unit assembly 41 is positioned and fixed in the direction of the container axis O with the fixing tool 45 by the pressing tool 47. The linear frame 47a may be divided into a plurality of divided structures along the vertical and horizontal cross sections, and may be assembled and used.

(Container body 1)
As shown in FIG. 3, the partition wall 21 installed in the shell body 20 </ b> B in the container main body 20 is composed of a vertical wall portion 21 </ b> V and a horizontal wall portion 21 </ b> H having a substantially container axis O as a corner portion. In the lower right, approximately 1/4 is formed in the evaporation chamber 23, and the remainder is formed in the reaction chamber 25. Here, although the container main body 20 is formed in a cylindrical shape, it may be a cylindrical shape such as a square tube or a polygonal tube shape of pentagon or higher.

  The partition wall 21 is configured to have a thermal expansion absorption structure that can expand and contract in a direction along the container axis O and the cross section of the container to absorb a difference in thermal expansion of the constituent members due to a temperature difference between the evaporation chamber 23 and the reaction chamber 25. Yes.

  That is, the partition wall 21 includes a partition wall base 51 along the container axis O direction on the inner surface of the shell body 20B, a main partition plate 52 attached to the evaporation chamber side of the partition base 51, and the partition base 51 On the reaction chamber 25 side, a double wall structure comprising a sub partition plate 53 attached with a certain gap 54 capable of absorbing thermal expansion in the direction along the cross section of the container between the main partition plate 52 and the main partition plate 52. Yes. Since the fixed gap 54 is held by the partition wall base 51, the thermal expansion (difference) in the direction along the transverse cross section of the container of the main and sub partition plates 52 and 53 can be absorbed. An axial direction slide mechanism 55 that can absorb thermal expansion in the container axis O direction within a predetermined range is provided between the partition wall substrate 51 and the main partition plate 52 and the sub partition plate 53. As shown in FIG. 6, the axial direction slide mechanism 55 includes a plurality of adjustment bolts (guided portions) 55 a penetrating in a tangential direction at regular intervals in the direction of the container axis O in the partition wall base 51, for example. A long hole (guide portion) 55b into which the adjustment bolt 55a is slidably fitted to the main and sub partition plates 52 and 53 is formed in parallel to the container axis O, and the containers in the main and sub partition plates 52 and 53 are formed. Thermal expansion (difference) in the direction of the axis O can be absorbed. The double wall structure and the axial direction slide mechanism 55 constitute a thermal expansion absorption structure.

  Here, as shown in FIG. 7 (a), the axial direction sliding mechanism 70 is fixed to the main and sub partition plates 52 and 53, and an elongated hole (guide portion) 55b. Can also be provided on the partition wall substrate 51. Further, in place of the adjusting bolt 55a and the elongated hole 55b, as shown in FIG. 7B, the axial direction sliding mechanism 71 has a protruding portion (guided portion) 71a and a guide rail (guide portion) 71b for guiding it. And can be configured. That is, the main and sub partition plates 52 and 53 are fixed to the partition wall base 51 via connecting means (bolts and nuts), welding, and the like to hold the gap 54, and the partition wall base 51 is further connected to the shell. Separate from body 20B. Then, a pair of protrusions (guided parts) 71a are integrally formed on both sides of the bottom of the partition wall base 51 in parallel with the container axis O, and both protrusions 71a are slidably guided to the shell 20B. A guide rail (guide portion) 71b is fixed. Further, as shown in FIG. 7 (c), the axial direction slide mechanism 72 is integrated with the rim portion (guided portion) 72a in parallel with the container axis O on the outer surface of the edge of the main and sub partition plates 52 and 53. And a guide rail (guide portion) 72b that slidably guides both protrusions 72a to the shell body 20B. Thus, the axial direction slide mechanisms 70 to 72 of the other embodiments shown in FIGS. 7A to 7C can also exhibit the same operational effects as the previous embodiments.

  The sub partition plate 53 is arranged corresponding to the arrangement site of the unit assembly 41, and the catalyst unit 24 is attached thereto. On the upstream side (the other end side) and the downstream side (one end side) of the exhaust gas of the sub partition plate 53, a movable seal portion 56 for preventing the exhaust gas from blowing through the gap 54 between the sub partition plate 53 and the main partition plate 52 is provided. The movable seal portion 56 can seal the exhaust gas following the displacement of the sub partition plate 53 in the direction of the container axis O and in the direction along the cross section of the container.

  That is, as shown in FIG. 8, the movable seal portion 56 has a fixed end attached to the main partition plate 52 via the mounting screw 56b, and a free end side that is in sliding contact with the end portion of the sub partition plate 53. The elastic sealing plate 56a. The elastic seal plate 56a has a curved cross section on the free end side, and is pressed against the end of the sub partition plate 53. The sub partition plate 53 is displaced from the main partition plate 52 by the displacement β in the container axis O direction and the crossing of the container. Even if it moves within the range of the displacement γ in the direction along the surface, it follows the displacement and slides on the end of the sub partition plate 53 due to its elasticity, so that the sealed state of the gap 54 can be maintained.

  Of course, as shown in FIG. 9, the fixed end of the elastic seal plate 57a is attached to the end plate 57c of the sub partition plate 53 via the mounting screw 57b, and the free end side is slidably contacted with the surface of the main partition plate 52. The seal part 57 can also be formed.

(How to use Example 1)
In the above configuration, in the NOx restricted sea area, the exhaust gas switching valve 17 is closed to close the bypass pipe 16, the denitration outlet valve 15 is opened to open the denitration gas discharge pipe 14, and the evaporation chamber outlet valve 33 is opened. Thus, the evaporation chamber 23 and the reaction chamber 25 are communicated. The exhaust gas discharged from the combustion chamber of the diesel engine 13 is introduced into the evaporation chamber 23 of the denitration reaction vessel 11 and mixed. Then, urea water (or ammonia water) is blown into the exhaust gas in the evaporation chamber 23 from the spray nozzle 22. Further, the exhaust gas into which urea water has been blown is introduced from the evaporation chamber 23 into the reaction chamber 25 via the evaporation chamber outlet valve 33 and the intermediate passage 32, and is allowed to pass through the catalyst unit 24 to be in contact with the catalyst element 43. NOx inside is reduced. Next, the denitration exhaust gas is introduced from the denitration gas outlet 28 through the denitration gas discharge pipe 14 to the intake port 12i of the turbine section 12T of the exhaust gas supercharger 12, and after driving the exhaust gas supercharger 12, the exhaust gas is exhausted from the exhaust port 12o. It is discharged through the chimney. In the compressor unit 12 </ b> C of the exhaust gas supercharger 12, combustion air (atmosphere) is sucked and compressed and supplied to the combustion chamber of the diesel engine 13.

  During operation of this exhaust gas denitration facility, both the constituent members of the evaporation chamber 23 and the constituent members of the reaction chamber are exposed to high-temperature exhaust gas, so that they thermally expand to the same extent and change less than when stopped (cold temperature). .

  Next, in the NOx non-regulated sea area, as shown in FIG. 2, the injection of urea water from the spray nozzle 22 is stopped, the exhaust gas switching valve 17 is opened, the bypass pipe 16 is communicated, and the denitration outlet valve 15 is closed. Then, the denitration gas discharge pipe 14 is closed, the evaporation chamber outlet valve 33 is closed, and the evaporation chamber 23 and the reaction chamber 25 are shut off. As a result, the exhaust gas discharged from the combustion chamber of the diesel engine 13 is introduced into the evaporation chamber 23 of the denitration reaction vessel 11 and mixed, and then introduced from the bypass pipe 16 to the intake port 12i of the turbine section 12T. After the supercharger 12 is driven, it is discharged from the exhaust port 12o through the exhaust chimney.

  At this time, since high temperature exhaust gas is not introduced into the reaction chamber 25, the evaporation chamber is at a high temperature and the reaction chamber 25 is at a low temperature. Due to this temperature difference, the main partition plate 52 of the partition wall 21 is thermally expanded, and the sub partition plate 53 is not thermally expanded as much as the main partition plate 52. However, since the partition wall 21 has a double wall structure having the gap 54, the thermal expansion difference in the cross-sectional direction of the denitration reaction vessel 11 is absorbed. Further, the difference in thermal expansion in the container axis O direction is absorbed by the axial direction slide mechanism, and the denitration reaction vessel 11 is not damaged by thermal strain.

(Effect of Example)
According to the above embodiment, in the NOx non-regulated sea area where the exhaust gas need not be denitrated, the exhaust gas switching valve 17 is opened and the bypass pipe 16 is communicated, and the evaporation chamber outlet valve 33 and the denitration outlet valve 15 are closed. The communication part 30 and the denitration gas discharge pipe 14 are closed, exhaust gases discharged from the combustion chambers of the plurality of diesel engines 13 are merged in the evaporation chamber 23, and untreated exhaust gas is discharged without blowing urea water (or ammonia water). It can introduce into the turbine part 12T of the exhaust gas supercharger 12 from the bypass pipe 16. At this time, even if a difference in thermal expansion occurs between the main partition plate 52 and the sub partition plate 53 of the partition wall 21 due to a temperature difference between the evaporation chamber 23 into which the exhaust gas is introduced and the reaction chamber 25 into which the exhaust gas is not introduced, the partition wall The double wall structure 21 can absorb the expansion / contraction difference in the direction along the transverse cross section of the container due to thermal expansion, and the axial center slide mechanism 55 of the partition wall 21 allows expansion / contraction due to thermal expansion in the container axis O direction. By absorbing the difference, it is possible to prevent the structural members such as the partition wall 21 of the denitration reaction vessel 11 from being damaged due to thermal distortion.

  Further, the axial direction slide mechanism 55 is constituted by an elongated hole 55b that is a guide portion and an adjustment bolt 55a that is a guided portion that is slidably engaged with the elongated hole 55b. The expansion and contraction due to the difference in thermal expansion can be effectively absorbed.

  Further, in the partition wall 21, since the movable seal portion 56 made of the elastic seal plate 56 a is provided at the opening ends of the main partition plate 52 and the sub partition plate 53, the sub partition plate 53 is displaced with respect to the main partition plate 52. In addition, since the elastic seal plate 56a follows and is slidably contacted with the sub partition plate 53, the gap between the main partition plate 52 and the sub partition plate 53 can be reliably sealed, and the exhaust gas generated by the gap 54 of the partition wall 21 can be sealed. Can be prevented.

(Another embodiment of the container body)
Another embodiment of the container body 20 will be described with reference to FIG. The same members as those in the previous embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this container main body 80, in order to make the evaporation chamber 83 approach a circular cross section where the exhaust gas and urea water (or ammonia water) can be mixed efficiently, the partition wall 81 that partitions the evaporation chamber 83 and the reaction chamber 85 has a gap. 54 is formed in a double wall structure composed of a main partition plate 52 and a sub partition plate 53 arranged via 54. Further, the partition wall 81 has inclined wall portions 81Vg and 81Hg inclined to the reaction chamber 25 side at intermediate ends of the outer peripheral vertical wall portion 81Vo and the outer peripheral horizontal wall portion 81Ho suspended from the shell 80B. An intermediate vertical wall portion 81Vm and an intermediate horizontal wall portion 81Hm are formed, thereby expanding the evaporation chamber 83 to the reaction chamber 85 side. Further, a chamfered inclined wall portion 81C for removing the corner portion is formed at the corner portion of the intermediate vertical wall portion 81Vm and the intermediate horizontal wall portion 81Hm. The double wall structure of the partition wall 81, the axial direction slide mechanism 55, and the movable seal portion 56 are similarly configured.

  In this manner, the cross-sectional shape is expanded so as to approach a substantially circular cross section without the corner portion that becomes a gas reservoir, thereby forming the evaporation chamber 83, thereby improving the retention of exhaust gas, and urea water or ammonia water and exhaust gas And the mixed state can be improved.

O Container axis 11 Denitration reaction vessel 12 Exhaust gas supercharger 12T Turbine part 12C Compressor part 13 Diesel engine 14 Denitration gas discharge pipe 15 Denitration outlet valve (gas shut-off valve)
16 Bypass pipe 17 Exhaust gas switching valve 20 Container body 20B Shell body 21 Bulkhead 22 Spray nozzle 23 Evaporation chamber 24 Catalyst unit 25 Reaction chamber 26 Exhaust gas inlet 27 Untreated gas outlet 28 Denitration gas outlet 30 Communication part 33 Evaporation chamber outlet valve (gas Shut-off valve)
41 Unit assembly 43 Catalytic element 44 Outer peripheral support 45 Fixing tool 46 Outer peripheral closing plate 47 Presser 51 Bulkhead substrate 52 Main partition plate 53 Subpartition plate 54 Gap 55 Axial direction slide mechanism 55a Adjustment bolt (guided portion)
55b Slot (guide part)
56 movable seal portion 56a elastic seal plate 57 movable seal portion 70 axial direction slide mechanism 71 axial direction slide mechanism 72 axial direction slide mechanism 81 partition wall 83 evaporation chamber 84 gap 85 reaction chamber

Claims (4)

A vessel provided with a reaction chamber provided with an evaporation chamber for blowing urea water or ammonia water into exhaust gas and a catalyst unit for contacting the exhaust gas into which urea water or ammonia water is blown, in a cylindrical reaction vessel An exhaust gas denitration reaction vessel,
In the container body, provided with an evaporation chamber and a reaction chamber partitioned by a partition along the container axial direction, and provided with an untreated gas outlet in the evaporator,
The partition wall is a thermal expansion absorption structure capable of absorbing the difference in thermal expansion between the constituent members of the evaporation chamber and the reaction chamber by expanding and contracting in the direction along the container axis and the cross section of the container,
The thermal expansion absorption structure is
A constant gap is formed between the main partition plate attached to the evaporation chamber side and the main partition plate attached to the reaction chamber side on the partition wall base material along the container axial direction on the inner surface of the shell of the container body. And a sub-partition plate to which the catalyst unit is attached, and a double wall structure, and a predetermined range in the container axial direction between the partition base material and the main partition plate and the sub-partition plate. It is equipped with an axial direction slide mechanism that is freely movable at
Further, at the front and rear end portions of the sub partition plate in the exhaust gas flow direction, heat between the sub partition plate and the main partition plate in the container axial direction of the sub partition plate and the main partition plate and in the direction along the cross section of the container. A marine exhaust gas denitration reaction vessel provided with a movable seal portion capable of following displacement due to expansion. The axial direction slide mechanism includes a main partition plate and a sub-partition plate, a guide portion formed on one side of the partition base material in the container axial direction, and a cover formed on the other and slidably engaged with the guide portion. The ship exhaust gas denitration reaction vessel according to claim 1, further comprising a guide member. The movable seal portion is provided with an elastic seal plate whose fixed end is attached to one of the end portions of the main partition plate and the sub partition plate and whose free end side is in sliding contact with the other. The vessel exhaust gas denitration reaction vessel as described. A marine exhaust gas denitration reaction vessel according to any one of claims 1 to 3,
An exhaust gas supercharger (turbocharger) that supplies exhaust gas from the reaction chamber to the intake port via a denitration gas discharge pipe;
A bypass pipe connecting the air supply port of the exhaust gas supercharger and the untreated gas outlet of the evaporation chamber;
An exhaust gas switching valve capable of opening and closing the bypass pipe;
An exhaust gas on-off valve capable of opening and closing the denitration gas discharge pipe interposed at least in the denitration gas discharge pipe,
An exhaust gas denitration facility for ships, wherein the evaporating chamber is also used as a manifold for joining exhaust gases discharged from a plurality of diesel engines to supply exhaust gases to the exhaust gas supercharger.

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