KR20140105562A - Exhaust gas denitration reaction container for ship, and denitration equipment for ship - Google Patents

Abstract

The present invention is characterized in that the evaporation chamber 23 for injecting urea water or ammonia water into the exhaust gas in the denitration reaction vessel 11 and the reaction chamber 25 for bringing the exhaust gas into contact with the catalyst unit 24 are provided in the separating wall 21 And the thermal expansion absorbing structure provided on the separating wall 21 has a structure in which the separating wall 21 is divided into a main partition plate 52 and a sub partition plate 53, Absorbing the difference in thermal expansion in the transverse direction of the reaction vessel 11 and providing an axial direction slide mechanism 55 between the body frame 20B and the main partition plate 52 and the sub partition plate 53 Absorbs the difference in thermal expansion in the direction of the axis of the container (O). The main partition plate 52 and the sub partition plate 53 are provided with a movable sealing portion having an elastic sealing plate slidingly contacting with the displacement of the sub partition plate 53 due to thermal expansion, Thereby preventing the exhaust gas from leaking to the gap 54 between the first and second exhaust ports.

Description

TECHNICAL FIELD [0001] The present invention relates to an exhaust gas denitration reaction vessel for a ship, and an exhaust denitration facility for a ship,

The present invention relates to an evaporation chamber (evaporation chamber) for ejecting urea water or ammonia water into an exhaust gas discharged from a diesel engine mounted on a ship, And a catalyst unit (catalyst unit) for removing nitrogen oxide (nitrogen oxide) in contact with the exhaust gas denitration reaction vessel (vessel exhaust gas reaction container) for a ship, And an exhaust gas denitration facility for a ship having the denitration reaction vessel.

In a denitration apparatus using selective catalytic reduction (SCR) to remove nitrogen oxides (hereinafter referred to as NOx) in exhaust gas discharged from an internal combustion engine (internal combustion engine), as a reducing agent The use of the number of elements is proposed in Patent Document 1 and the like.

The ship is equipped with a large diesel engine. In order to use exhaust gas from the diesel engine for the purpose of effective use of a limited space, an evaporation chamber for injecting urea water or ammonia water as a reducing agent for desalting into the exhaust gas, a catalyst element of a denitration catalyst for removing NOx, ) Is placed in one reaction vessel can be considered as the denitration reactor.

Patent Document 1: Japanese Patent Application Laid-Open No. 2011-144765

By the way, in some sea area (NOx restricted sea area), there is movement to carry out regulation to reduce NOx in exhaust gas discharged from ship's diesel engine considerably from present regulations. In the case where the NOx-restricted sea area and the NOx-free sea area which do not specify the reduction of nitrogen oxides are navigated, it is not necessary to introduce the exhaust gas into the reaction chamber in the NOx-free sea area. Therefore, when the evaporation chamber and the reaction chamber are provided in one reaction vessel as described above, thermal distortion (thermal distortion) arising from the difference in thermal expansion due to the temperature difference between the evaporation chamber and the reaction chamber causes the constituent members Parts) may be damaged.

The present invention relates to a vessel exhaust gas denitration reaction vessel capable of effectively absorbing a difference in thermal expansion due to a temperature difference between an evaporation chamber and a reaction chamber to prevent damage due to thermal distortion in a denitration reactor having an evaporation chamber and a reaction chamber integrally formed therein, And an object of the present invention is to provide a ship exhaust gas denitration facility having the denitration reaction vessel.

The invention described in claim 1 is characterized in that a reaction chamber provided with a cylindrical reaction vessel is provided with an evaporation chamber for ejecting urea water or ammonia water into the exhaust gas and a catalyst unit for contacting the urea water or the exhaust gas from which the ammonia water is ejected And a separation wall partitioning the reaction chamber into the evaporation chamber and the reaction chamber is provided along the direction of the axis of the vessel and the untreated gas outlet is formed in the evaporation chamber, Wherein the thermal expansion absorbing structure is a thermal expansion absorbing structure capable of absorbing a difference in thermal expansion between the vaporizing chamber and the constituent members of the reaction chamber by expanding and contracting the wall in the direction along the container axis and the transverse section of the reaction vessel, From the inside of the body frame, Which comprises a main partition plate attached to the evaporation chamber side and a sub partition plate which is attached to the reaction chamber side and is spaced apart from the main partition plate by a predetermined distance and on which the catalyst unit is attached, And a central axis direction slide mechanism which is movable between a predetermined position in the axial direction of the container and between the partition wall substrate and the main partition plate and the sub partition plate, A movable sealing portion which can follow the displacements due to thermal expansion in the axial direction of the container axis of the sub-partition plate and the main partition plate and in the transverse section of the reaction vessel between the sub-partition plate and the main partition plate at the front and rear ends in the transfer direction Is installed.

According to a second aspect of the present invention, in the structure of Claim 1, the axial-direction sliding mechanism includes the main partition plate and the sub partition plate, a guide portion formed on one side of the partition wall base in the container axis direction, And a guided member slidably coupled to the guide portion.

According to a third aspect of the present invention, in the structure described in the first or second aspect, the movable sealing portion has a fixing end attached to one end portion of the main partition plate and the sub partition plate, And an elastic sealing plate.

According to a fourth aspect of the present invention, there is provided a marine exhaust gas denitration reaction vessel according to any one of the first to third aspects, an exhaust gas supercharger for supplying exhaust gas from the reaction chamber through a denitration gas discharge pipe to the feed mechanism, A bypass pipe connecting the feed mechanism of the gas supercharger and the untreated gas outlet of the evaporation chamber, an exhaust gas switching valve capable of opening and closing the bypass pipe, and a gas introduction portion that is inserted into at least the denitration gas discharge pipe, And a shutoff valve. The evaporation chamber also serves as a manifold that joins the exhaust gas discharged from the plurality of diesel engines to supply the exhaust gas to the exhaust gas supercharger.

According to the invention described in claim 1, an evaporation chamber and a reaction chamber partitioned by a separation wall are integrally provided in a reaction vessel. In the thermal expansion absorbing structure of the separating wall, the main partition plate and the sub partition plate are arranged at a constant interval to form a double wall structure, thereby absorbing elongation along the cross section of the container. Also, the elastic deformation in the direction of the container axis is absorbed by the axial wall slide mechanism provided at the attachment portion of the partition wall substrate, the main partition plate and the sub partition plate.

Therefore, when the exhaust gas of the evaporation chamber is discharged from the outlet of the untreated exhaust gas, the evaporation chamber becomes a high temperature state and the reaction chamber becomes a low temperature state at the time of non-degassing treatment in which no exhaust gas is introduced into the reaction chamber It is possible to effectively absorb expansion and contraction by the thermal expansion absorbing structure of the separating wall and to prevent the component members of the reaction vessel from being damaged due to thermal distortion.

According to the invention described in claim 2, since the axial direction slide mechanism is constituted by the guide part and the guided part which is slidably engaged with the guide part, the expansion and contraction in the axial direction due to the difference in thermal expansion between the main partition plate and the sub- It can be effectively absorbed.

According to the invention described in claim 3, since the elastic sealing plate is provided between the sub partition plate and the main partition plate at the front and rear ends of the sub partition plate, the direction of the container axis in the sub partition plate and the main partition plate, It is possible to follow the displacement of the sub partition plate or the main partition plate and securely seal the gap between the main partition plate and the sub partition plate, It is possible to reliably prevent leakage of the gas.

According to the invention described in claim 4, when the exhaust gas is not denitrated in the NOx-free sea area or the like, the exhaust gas switching valve is opened to allow the bypass pipe to pass therethrough and the gas shutoff valve is closed, . Accordingly, the exhaust gas discharged from the plurality of diesel engines and merged in the evaporation chamber can be introduced into the exhaust gas supercharger from the untreated exhaust gas outlet of the evaporation chamber through the bypass pipe. In this case, a temperature difference occurs between the evaporation chamber into which the exhaust gas flows and the reaction chamber into which the exhaust gas does not flow. Due to this temperature difference, there is a difference in expansion and contraction due to thermal expansion between the main partition plate and the sub partition plate of the partition wall. However, the double wall structure which is a part of the thermal expansion absorbing structure of the separation wall can absorb the expansion and contraction difference in the direction along the transverse section of the container in the separation wall. Also, the difference in expansion and contraction in the axial direction of the container can be absorbed by the axial direction slide mechanism which is the remaining portion of the thermal expansion absorbing structure of the separation wall. Therefore, thermal distortion due to the temperature difference between the evaporation chamber and the reaction chamber can be effectively absorbed, and the constituent members of the reaction vessel can be prevented from being damaged by thermal distortion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram for describing an embodiment of a ship exhaust gas denitration plant according to the present invention and illustrating denitration. FIG.
[Fig. 2] Fig. 2 is a schematic view for explaining a marine exhaust gas denitration facility of a sloping seawater.
3 is a cross-sectional view showing a vessel for exhaust gas denitration reaction for marine use.
4 is a partial longitudinal cross-sectional view of an exhaust gas denitration reaction vessel.
5 is a perspective view of a denitration unit.
6 is a perspective view showing a slide mechanism in the axial direction.
[Fig. 7A] is a perspective view showing a first modification of the axial-direction slide mechanism.
[Fig. 7B] A perspective view showing a second modification of the axial-direction slide mechanism.
[Fig. 7C] is a perspective view showing a third modification of the axial-direction slide mechanism;
8 is a longitudinal sectional view showing the movable sealing portion.
9 is a longitudinal sectional view showing another embodiment of the movable seal portion.
10 is a side view showing an outer common zone of the unit assembly;
11 shows the support of the unit aggregate, the left side shows a pressurizing port, and the right side shows a fixture.
12 is a partial perspective view showing the fixture.
13 is a cross-sectional view showing a second embodiment of the exhaust gas denitration reaction vessel.

[Example 1]

Hereinafter, a first embodiment of the present invention will be described with reference to Figs. 1 to 12. Fig.

(Ship exhaust gas treatment facility)

1 is a schematic view showing an exhaust gas denitration facility for marine use (exhaust gas degassing facility for marine vessel) for denitration treatment of exhaust gas discharged from a combustion chamber of a marine diesel engine 13 according to the present invention. Fig. In the figure, reference numeral 11 denotes a denitration reaction vessel (reaction vessel), and 12 denotes an exhaust gas supercharger driven by the exhaust gas of the diesel engine 13. A separation wall 21 is provided in the container body 20 of the denitration reaction vessel 11 along the direction of the container axis O, A boiling chamber 23 and a reaction chamber 25 are integrally accommodated in the chamber. An evaporation chamber 23 for ejecting urea water (or ammonia water) into the exhaust gas is formed in a lower portion (lower portion) of the separating wall 21, A reaction chamber 25 is formed in which a plurality of catalyst units (catalytic unit) 24 are brought into contact with the exhaust gas from which the number of urea gases is ejected to reduce NOx.

The container body 20 of the denitration reaction vessel 11 is constituted by a cylindrical body frame 20B having both end portions curved and having a convex shape, (Pressure end plates) 20R, 20L. A plurality of exhaust gas inlets 26 for introducing exhaust gas into the evaporation chamber 23 are formed at the bottom of the body frame 20B. Exhaust gas discharged from a plurality of combustion chambers (four in the drawing) of the diesel engine 13 flows into the evaporation chamber through the exhaust gas inlet 26, respectively. This evaporation chamber 23 also serves as an exhaust gas manifold for joining the exhaust gases introduced from the plurality of exhaust gas inlets 26. [ An untreated gas outlet 27 communicating with the evaporation chamber 23 is formed in the lower portion of the end plate 20L on one side of the body frame 20B. A denitration gas outlet 28 for communicating with the reaction chamber 25 to exhaust the denitration exhaust gas is formed in the upper portion of the end plate 20L on one side of the body frame 20B.

The exhaust gas turbocharger 12 has a turbine section 12T and a compressor section 12C connected to each other by an input / output shaft (input / output shaft). In the turbine section 12T, untreated exhaust gas or denitration exhaust gas discharged from the combustion chamber of the diesel engine 13 through the denitration reaction vessel 11 is supplied to a feed mechanism 12i. The exhaust gas discharged from the exhaust port (120) of the turbine section (12T) is exhausted from the exhaust chimney. Further, the compressor section 12C sucks and pressurizes the air from the intake port to supply the pressurized air as combustion air from the exhaust port 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 feed mechanism 12i of the turbine portion 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 feed mechanism 12i of the denitration gas discharge pipe 14. A denitration outlet valve made of a butterfly valve is connected to the denitration gas discharge pipe 14 on the upstream side of the connection between the denitrification gas discharge pipe 14 and the bypass pipe 16 Valve) 15 is provided. And the denitration gas discharge pipe (14) can be closed by the denitration outlet valve (15). The bypass pipe 16 is provided with an exhaust gas switching valve 17 composed of a butterfly valve capable of opening and closing the bypass pipe 16.

(Denitration reaction vessel)

A spray nozzle 22 for spraying urea water or ammonia water into the exhaust gas of the evaporation chamber 23 is disposed in one of the end plates 20L of the container main body 20. And a connecting portion 30 is formed on the other end plate 20R side of the container main body 20. [ The connection portion 30 is disposed along the transverse plane of the reaction vessel 11 between the separation wall 21 and the body frame 20B of the evaporation chamber 23 and is provided with the evaporation chamber 23 An intermediate passage (intermediate passage) 32 formed between the separating wall 21 (partition wall 31) and the other end plate 20R, and an intermediate passage An evaporation chamber outlet valve (gas shutoff valve) 33 provided in an opening of the wall 31 and an evaporation chamber 32 which is formed in the partition wall 31 and in which the evaporation chamber 23 and the reaction chamber 25 are equipotential And a single or a plurality of pressure adjusting ports 34 for adjusting the pressure of the ink.

Here, the denitration outlet valve 15 of the denitration gas discharge pipe 14 is closed while the evaporation outlet port valve 33 is removed to open the opening of the denitration gas discharge pipe 14, All the exhaust gas can be flowed from the evaporation chamber 23 to the turbine section 12T of the exhaust gas turbocharger 12 by using a resistance (air resistance). In this case, since there is no pressure difference between the evaporation chamber 23 and the reaction chamber 25, there is no need to form the capturing hole 34. [

(Reaction chamber)

As shown in Figs. 3 and 4, unit assemblies 41 are provided in the reaction chamber 25. The unit aggregate 41 is stacked in a vertically and horizontally stacked manner and connected in the direction of the container axis O between the separation wall 21 and the trunk frame 20B. The catalytic unit 24 includes a housing frame 42 having a cutting hole 42a formed on a side surface facing the catalytic unit 24 as shown in FIG. 5, And a catalytic element (43) of a honeycomb cross section. As the cross-sectional shape of these unit assemblies 41, those having a rectangular cross section or a trapezoid cross section as shown in Fig. 13 are employed.

The unit assembly 41 is supported by a plurality of outer circumferential support members 44 for adjusting the distance between the body frame 20B and the unit assembly 41 in the trunk frame 20B have. A fixing member 45 and an outer circumferential member 45 which closes a space between the body frame 20B and the unit aggregate 41 are provided on one end side (downstream side of the exhaust gas flow) of the reaction chamber 25, And a closing plate (outer peripheral closing plate) 46 is disposed. And a pressing tool 47 is disposed on the other end side (the upstream side of the exhaust gas flow) of the reaction chamber 25. The unit aggregate 41 is supported in the trunk frame 20B by the outer peripheral wall 44, the fixing member 45, the outer peripheral closing plate 46, and the pressing member 47. In addition, a line indicating the arrow direction in the cross section A-A shown in Fig. 4 indicates the cross-sectional position in Fig.

As shown in Fig. 10, the outer circumferential surface 44 has a pair of tapered sleeves which are cut at an inclined surface (inclined surface) inclined at a predetermined angle with respect to an axis parallel to the container axial center O, and taper sleeves 44a and 44b. One of the tapered sleeves 44a of these tapered sleeves 44a and 44b is attached to the housing frame 42 of the catalyst unit 24. [ And the other tapered sleeve 44b is attached to the body frame 20B through a connecting member (connection member) 44c. The connecting bolts / nuts 44d are loosely inserted into the shaft holes 44e and 44f of the tapered sleeves 44a and 44b and the sliding limit of the tapered sleeves 44a and 44b is limited by the connecting bolts / . The difference in elongation and shrinkage in the direction of the axis of the container O due to the thermal expansion of the body frame 20B and the unit assembly 41 in the slide range of the tapered sleeves 44a and 44b by the connecting bolt / Can be absorbed. The outer peripheral portion of the unit aggregate 41 is supported between the trunk frame 20B and the separating wall 21 by these outer peripheral edges 44. [

The fixture 45 provided at the downstream end of the exhaust gas flow in the unit aggregate 41 has the arrangement pattern of the catalyst unit 24 as shown in the right part of Fig. 11 and Fig. 12 Shaped frame-shaped frame 45a that corresponds to a rectangular plate-shaped frame 45a. In the plate-shaped frame 45a, a beveled front end portion is brought into contact with a contact portion between adjacent catalytic units 24. The outer peripheral end portion of the plate-shaped frame 45a is connected and fixed to the body frame 20B by the attachment member 45b so that the unit assembly 41 is moved to the downstream side of the exhaust gas . The outer peripheral closing plate 46 is provided on the downstream side of the attachment member 45b to shield the exhaust gas. The edge portion of the plate-shaped frame 45a is formed to have a sectional shape cut in half.

The pushing member 47 provided at the upstream end of the exhaust gas flow in the unit assembly 41 is integrally formed as shown in the left part of Fig. 11, corresponding to the arrangement pattern of the catalyst unit 24 And a linear frame 47a in a substantially lattice pattern. The line-shaped frame 47a is formed in the shape of a rod having a circular section and is joined to a taper groove formed on the entire surface of the contact portion between adjacent catalyst units 24. [ A push bolt 47c in the direction of the container axial center O is coupled to a bracket 47b mounted on the body frame 20B. The pressing bolt 47c is fixed in a pressurized state by a lock nut 47d and the tip of the pressing bolt 47c is pressed through the pressing plate 47e so that the linear frame 47a And is pressed by the catalyst unit 24. The unit aggregate 41 is positioned and fixed in the direction of the container axis O between the fixture 45 and the unit aggregate 41 by the pushing tool 47. [ Further, in the first embodiment, the substantially lattice-shaped linear frame 47a has a one-piece structure. However, the linear frame 47a may be assembled by being divided into a plurality of divided structures along a vertical and horizontal cross section.

(Container body 1)

3, the separating wall 21 provided in the body frame 20B in the container body 20 is connected in an L-shape with a corner portion in the vicinity of the container axis O (Vertical wall portion) 21V and a horizontal wall portion (horizontal wall portion) 21H and approximately 1/4 of the lower right portion of the partition defined by the separation wall 21 is formed in the evaporation chamber 23 And 3/4 of the remaining portion are formed in the reaction chamber 25, respectively. Although the container body 20 is formed in a cylindrical shape here, it may be a tubular shape such as a quadrangular tube or a polygonal tube having a pentagonal shape or more.

The separating wall 21 is capable of absorbing the difference in thermal expansion of the component due to the temperature difference between the evaporation chamber 23 and the reaction chamber 25 in the direction along the container axis O and the cross- And a thermal expansion absorbing structure (thermal expansion absorbing structure).

That is, the separating wall 21 has a separating wall base material (separating wall base material) 51 attached to the inner surface of the trunk frame 20B along the direction of the container axis O. The main partition plate 52 attached to the evaporation chamber side and the reaction chamber 25 side of the partition wall substrate 51 are provided on the partition wall substrate 51 so as to be in contact with the main partition plate 52 (Double wall structure) comprising a main partition plate 52 and a sub partition plate 53 are provided with a sub partition plate 53 attached with a constant interval 54 between the main partition plate 52 and the sub partition plate 53, Respectively. This double wall structure can maintain a constant gap 54 by the partition wall base 51 to absorb the thermal expansion (difference) in the direction along the cross section of the container in the main and sub partition plates 52 and 53 have. And the partition wall plate 51 and the main partition plate 52 and the sub partition plate 53 are provided with an axial center slide mechanism capable of absorbing thermal expansion in the direction of the container axis O within a predetermined range Direction slide mechanism) 55 are provided. 6, the axial-direction slide mechanism 55 is provided with a plurality of adjustment bolts (the guide portions 51a, 51b, 51c, (To-be-guided portion) 55a is provided so as to penetrate in the tangential direction of the container. An elongated hole (guide portion) 55b is formed parallel to the container axis O so that the adjustment bolt 55a is slidably engaged with the main and sub partition plates 52 and 53, respectively. Therefore, the adjustment bolt 55a and the long hole 55b can absorb the thermal expansion (difference) in the direction of the container axis O in the main and sub partition plates 52 and 53. [ The double wall structure and the axial direction slide mechanism (55) constitute a thermal expansion absorbing structure.

Modifications 1 to 3 of the axial-direction slide mechanism 55 will now be described with reference to Figs. 7A to 7C. Fig.

In the modification 1 shown in Fig. 7A, the axial-direction sliding mechanism 70 is configured such that the adjusting bolt (guided portion) 55a is fixed to the main partition plates 52 and 53, (55b) is provided on the separating wall base (51).

In the modification 2 shown in Fig. 7B, the axial-direction sliding mechanism 71 changes the adjusting bolt 55a and the elongated hole 55b to move the protruding portion (guided portion) 71a and the guiding portion And a guide rail (guide portion) 7lb. The main and sub partition plates 52 and 53 are fixed to the separating wall base 51 through connection means such as bolts and nuts or welding or the like to maintain the spacing 54, The base material 51 is separated from the trunk frame 20B. A pair of protruding portions (guided portions) 71a are integrally formed on both sides of the bottom portion of the separating wall base 51 in parallel with the container axis O and both protruding portions 71a are formed on the trunk frame 20B And a guide rail (guide portion) 71b guiding the respective slidable members.

In the modification 3 shown in Fig. 7C, the axial direction slide mechanism 72 is provided with projections (guided portions) 72a on the outer surfaces of the edge portions of the main and sub partition plates 52 and 53, ) In parallel with each other. A guide rail (guide portion) 72b for guiding both projections 72a to be slidable is fixed to the body frame 20B.

As described above, Modifications 1 to 3 of the axial-direction slide mechanisms 70 to 72 shown in Figs. 7A to 7C can obtain the same operational effects as those of the previous embodiment.

Further, the sub partition plate 53 is arranged corresponding to the arrangement position of the unit aggregate 41, and the catalyst unit 24 is attached. The exhaust gas in the interval 54 between the sub partition plate 53 and the main partition plate 52 is provided on the upstream side (the other end side) and the downstream side (one end side) of the exhaust gas in the sub partition plate 53, And a movable sealing portion (movable sealing portion) 56 for preventing leakage of the gas is provided. The movable sealing portion 56 can seal the exhaust gas in the direction of the container axis O of the sub-partition plate 53 and the displacement along the transverse section of the container.

8, the fixed end is fixed to the main partition plate 52 through the attachment vis 56b, and the movable end 56 is fixed to the free end side A heat-resistant elastic sealing plate 56a is provided which is in sliding contact with the free end side of the partition plate 53 at the end thereof. The end surface of the elastic sealing plate 56a has a curved cross section and is brought into pressure contact with the end of the sub partition plate 53. Therefore, even if the sub partition plate 53 moves with respect to the main partition plate 52 in the range of the displacement? In the direction of the container axis O and the displacement? In the direction along the transverse section of the container, The elastic sealing plate 56a is brought into sliding contact with the end portion of the sub-partition plate 53 so as to maintain the sealed state of the gap 54 following the displacement.

The movable sealing portion 57 shown in Fig. 9 may also be provided. The fixed end of the elastic sealing plate 57a is attached to the end plate 57c of the partition plate 53 through the attachment screw 57b and the end of the elastic sealing plate 57a is fixed to the end of the main partition plate 52 Sliding contact with the surface. Thus, the sealed state of the gap 54 can be maintained.

(Usage Method of Example 1)

In the above configuration, when the NOx limited sea area is navigated, the exhaust gas switching valve 17 is closed so that the bypass pipe 16 is closed and the denitration outlet valve 15 is opened, (14) is opened. The evaporation chamber valve 33 is operated to open the evaporation chamber 23 and the reaction chamber 25. 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. (Or ammonia water) from the spray nozzle 22 into the exhaust gas of the evaporation chamber 23. [ The exhaust gas from which the urea water has been ejected flows into the reaction chamber 25 from the evaporation chamber 23 through the evaporation chamber port valve 33 and the intermediate passage 32. The exhaust gas passes through the catalyst unit 24 and contacts the catalytic element 43, whereby NOx in the exhaust gas is reduced. The denitration exhaust gas flows from the denitration gas outlet 28 to the feed mechanism 12i of the turbine portion 12T of the exhaust gas turbocharger 12 through the denitration gas discharge pipe 14 to drive the exhaust gas turbocharger 12 do. Thereafter, the denitration exhaust gas is exhausted from the exhaust port 120 through the exhaust chimney. In the compressor section 12C of the exhaust gas turbocharger 12, combustion air (atmospheric air) is sucked, compressed, and supplied to the combustion chamber of the diesel engine 13.

Since the constituent members of the evaporation chamber 23 and the constituent members of the reaction chamber are each exposed to the exhaust gas at a high temperature during the operation of the exhaust gas denomination system, the same thermal expansion occurs and the change Is small.

2, the injection of urea water from the spray nozzle 22 is stopped and the exhaust gas switching valve 17 is opened to open the bypass pipe 16 I will let him go. The denitration outlet valve 15 is closed to close the denitration gas discharge pipe 14 and the evaporation outlet valve 33 is closed to shut off the evaporation chamber 23 and the reaction chamber 25. 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 with the exhaust gas from the bypass tube 16 to the turbine section 12T, (12i), drives the exhaust gas turbocharger (12), and then is discharged from the exhaust port (120) through the exhaust chimney.

At this time, since the high temperature exhaust gas does not flow into the reaction chamber 25, the evaporation chamber 23 into which the exhaust gas flows becomes high temperature, and the reaction chamber 25 becomes low temperature. The main partition plate 52 of the separating wall 21 thermally expands due to the temperature difference and the sub partition plate 53 does not thermally expand as much as the main partition plate 52. However, since the separating wall 21 is a double wall structure having an interval 54, the difference in thermal expansion in the cross-sectional direction of the denitration reaction vessel 11 is absorbed. Further, the thermal expansion difference in the direction of the axis of the container (O) is absorbed by the axial direction slide mechanism, and the dense reaction container (11) is not damaged by thermal distortion.

(Effect of Embodiment 1)

According to the first embodiment, the exhaust gas switching valve 17 is opened to pass through the bypass pipe 16 at the NOx-free sea area where the exhaust gas is not subjected to denitration treatment, and the evaporation exhaust port valve 33, The outlet valve 15 is closed to close the connecting portion 30 and the denitration gas discharging pipe 14. The exhaust gas discharged from the combustion chamber of the plurality of diesel engines 13 is merged in the evaporation chamber 23 so that the untreated exhaust gas is discharged from the bypass pipe 16 to the exhaust gas turbocharger Flows into the turbine section 12T of the turbine section 12. The main partition plate 52 and the sub partition plate 53 of the separation wall 21 are separated by the temperature difference between the evaporation chamber 23 into which the exhaust gas flows and the reaction chamber 25 into which the exhaust gas is not introduced, It is possible to absorb the expansion and contraction in the direction along the transverse section of the container due to the thermal expansion due to the double wall structure of the partition wall 21. [ The expansion and contraction difference due to the thermal expansion in the direction of the axis of the container O is absorbed by the axial direction slide mechanism 55 of the separation wall 21 so that the expansion and contraction of the separation wall 21, It is possible to prevent the constituent member from being damaged in advance.

The axial direction slide mechanism 55 is constituted by the elongated hole 55b serving as the guide part and the adjusting bolt 55a serving as the guided part slidably engaged with the elongated hole 55b, So that expansion and contraction due to the difference in thermal expansion in the axial direction can be effectively absorbed.

Since the movable sealing portion 56 made of the elastic sealing plate 56a is provided at the opening end of the main partition plate 52 and the sub partition plate 53 in the partition wall 21, Even if the sub partition plate 53 is displaced with respect to the plate 52, the elastic seal plate 56a follows and comes into sliding contact with the sub partition plate 53. [ As a result, the gap between the main partition plate 52 and the sub partition plate 53 can be securely sealed, and the leakage of the exhaust gas due to the interval 54 of the partition walls 21 can be prevented.

(Example 2)

Embodiment 2 of the container main body 20 will be described with reference to Fig. The same members as those of the previous embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The evaporation chamber 83 in the container body 80 is intended to approach a circular cross section where the exhaust gas and urea water (or ammonia water) can be efficiently mixed. The partition wall 81 for partitioning the evaporation chamber 83 and the reaction chamber 85 is formed by a double partition structure consisting of a main partition plate 52 and a sub partition plate 53, . The separating wall 81 also has an inclined wall portion inclined with respect to the reaction chamber 25 side at an intermediate end portion of the outer peripheral wall portion 81Vo and the outer peripheral wall portion 81Ho formed perpendicularly to the body frame 80B Wall portions) 81Vg and 81Hg are inserted to form an intermediate vertical wall portion 81Vm and an intermediate horizontal wall portion 81Hm. The cross sectional area of the evaporation chamber 83 is extended toward the reaction chamber 85 side. A bevel ring inclined wall portion 81C for eliminating the corner portion is formed at a corner of the intermediate vertical wall portion 81Vm and the intermediate horizontal wall portion 81Hm. The double wall structure of the separating wall 81, the axial slide mechanism 55, and the movable sealing portion 56 are similarly configured.

According to the second embodiment, in addition to the action and effect of the first embodiment, the evaporation chamber 83 extended to approach the substantially circular cross section is formed, thereby eliminating the corner where the gas stagnates, It is possible to reduce the retention of the exhaust gas and improve the mixing state of the urea water or the ammonia water and the exhaust gas.

11; Denitration reaction vessel
12; Exhaust gas supercharger
12i; Feed mechanism
13; Diesel engine
14; Denitration gas discharge pipe
15; Outlet valve
16; Bypass tube
17; Exhaust gas switching valve
20; The container body
20B, 80B; Body frame
21; Separation wall
22; Spray nozzle
23; Evaporation chamber
24; Catalyst unit
25; Reaction chamber
26; Exhaust gas inlet
27; Untreated gas outlet
28; Dencho gas outlet
31; Compartment wall
33; Evaporation chamber outlet valve
41; Unit aggregate
42; Storage frame
43; Catalytic element
45; Fixture
51; Separation wall substrate
52; Main partition plate
53; Sub partition plate
54; interval
55, 71; Axis direction slide mechanism
55a; Adjusting bolt
55b; slit
56, 57; The movable sealing portion
57a; Elastic sealing plate
71a, 72a; projection part
7lb, 72b; Guide rail
O; Vessel height

Claims (4)

A reaction chamber (reaction container) formed in a tubular shape is provided with an evaporation chamber (evaporation chamber) for ejecting urea water or ammonia water into an exhaust gas, An exhaust gas denitration reaction vessel for a marine exhaust gas having a reaction chamber provided with a catalyst unit for contacting an exhaust gas,
A partition wall separating the evaporation chamber and the reaction chamber is provided in the container body of the reaction vessel along the direction of the axis of the container (the direction of the axis of the container), and an untreated gas outlet is formed in the evaporator and,
A thermal expansion absorbing structure capable of absorbing a difference in thermal expansion between the vaporizing chamber and the constituent members of the reaction chamber by stretching and shrinking the separating wall in a direction along the container axial center and a transverse plane of the reaction vessel Structure)
The thermal expansion absorbing structure comprises:
(Main partition plate) attached at the side of the evaporation chamber to the partition wall base material (partition wall base material) along the vessel axis direction from the inner side of the body frame of the container main body, And a secondary partition plate having the catalytic unit attached thereto, the secondary partition wall being a double wall structure,
And an axial-direction slide mechanism (axial-direction slide mechanism) movable between a predetermined range in the vessel axial direction between the partition wall substrate and the main partition plate and the sub-
And in the front and rear ends in the direction of transporting the exhaust gas in the direction of transport of the exhaust gas in the subdivision plate, a thermal expansion in the direction of the axis of the container of the subdivision plate and the main partition plate and in the direction along the cross- (Movable sealing portion) capable of following the displacement caused by the movable sealing portion
Wherein the exhaust gas denitration reaction vessel for a marine exhaust gas is provided.
The method according to claim 1,
In the axial-direction slide mechanism,
The main partition plate and the sub partition plate,
A guide portion formed on one side of the partition wall substrate in the direction of the axis of the container,
And a guided member formed on the other side and slidably engaged with the guide portion
Wherein the exhaust gas denitration reaction vessel is provided with the exhaust gas denitration reaction vessel.
3. The method according to claim 1 or 2,
The stationary end of the movable sealing portion is attached to one end of the main partition plate and the sub partition plate and the free end side of the movable partition is slidingly contacted with the other end Characterized in that the exhaust gas denitration reaction vessel is provided with an elastic sealing plate.
A ship exhaust gas denitration reaction vessel according to any one of claims 1 to 3,
An exhaust gas supercharger for supplying exhaust gas from the reaction chamber through a denitration gas exhaust pipe to a supply port,
A bypass pipe connecting the feed mechanism of the exhaust gas supercharger and the untreated gas outlet of the evaporator;
An exhaust gas switching valve capable of opening and closing the bypass pipe,
A gas shutoff valve inserted into at least the denitration gas discharge pipe and capable of opening and closing the denitration gas discharge pipe
Respectively,
Wherein the evaporation chamber also serves as a manifold for joining the exhaust gas discharged from a plurality of diesel engines to supply exhaust gas to the exhaust gas supercharger.

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