SCR (Selective Catalytic Reduction) device for denitration and dust removal of ship

Abstract

The utility model relates to an SCR (Selective Catalytic Reduction) device for denitration and dust removal of a ship. The device comprises a shell, an NOX waste gas inlet pipe and a waste gas outlet, the NOX waste gas inlet pipe and the waste gas outlet are arranged at the two ends of the shell in tandem, a catalysis module is arranged on the side, close to the NOX waste gas inlet pipe, in the shell, and a dust removal module is arranged on the side, close to the waste gas outlet, in the shell. The catalytic module comprises a denitration catalyst filling net and an NH3 nozzle, the dust removal module is an electrostatic dust collector, a quicklime filling net is arranged in the NOX waste gas inlet pipe, a drainage plate is further arranged between the catalytic module and the dust removal module, waste gas sequentially flows through the quicklime filling net, the NOX filling net and the electrostatic dust collector, and the purposes of denitration and dust removal are achieved. Compared with the prior art, the device disclosed by the utility model has the advantages that most of SO2 gas is firstly removed, and convection is formed between waste gas and NH3 through the drainage plate, so that the contact area between the waste gas and the NH3 is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to green ship technical field relates to a ship denitration dust removal's SCR device, especially relates to a kind of for ship exhaust gas aftertreatment's SCR device. BACKGROUND

[0002] Diesel engine is one of the main power systems of ship, and is widely used due to its high power and low failure rate. However, SO2, nitrogen oxides (NO X） and other toxic gases emitted by diesel engine seriously threaten the global environment and human health. A large number of studies have shown that selective catalytic reduction (SCR) technology can effectively remove NO X from harmful gases. NH3 is used to react with toxic NO and NO2 in exhaust gas to generate harmless N2 and H2O. Since the reaction is slow, noble metals such as Cr and Pt are often added as catalysts to improve the reaction rate in practical applications. However, SO2 can cause catalyst contamination and make it ineffective, resulting in reduced denitration efficiency of the SCR device. To solve this problem, many scholars have proposed many methods to solve these problems.

[0003] In patent No. 202320927907.7 "Ship SCR denitration reactor", the device is filled with catalyst at different positions inside the reactor to improve the removal efficiency of NO X . However, during the removal process, the exhaust gas cannot form a turbulent flow inside the reactor, which cannot improve the contact area between the exhaust gas and NH3 in the reactor, thereby further improving the removal efficiency. In patent No. 201920132787.5 "Offshore oil ship SCR desulfurization device", one end of the connecting pipe is communicated with the mounting pipe, and the other end of the mounting pipe away from the connecting pipe is communicated with the tail pipe. The other end of the connecting pipe away from the mounting pipe is communicated with the electrostatic precipitator, and the side of the electrostatic precipitator away from the connecting pipe is communicated with the mixing pipe, which can monitor the temperature of the exhaust gas and perform thermal compensation, remove a large amount of dust and impurities in the exhaust gas, and ensure the desulfurization efficiency and effect. The device effectively removes particulate matter (PM) and NO X from exhaust gas, but SO2 in the reaction can cause catalyst contamination and reduce removal efficiency.

[0004] In summary, the existing ship SCR device has many problems, and it is necessary to develop a high-efficiency, simple-structure and reusable ship SCR device. UTILITY MODEL CONTENTS

[0005] The utility model discloses a ship denitration dust removal's SCR device to overcome the problem of above-mentioned ship SCR device, provide a kind of ship denitration dust removal's SCR device, the device utilizes guide vane to form waste gas and NH3 convection in the way of physical flow guide, to improve the removal efficiency of NO X , in addition, the utility model adopts the method of first preliminary reduction SO2 concentration, then remove NO X , first waste gas passes through moist quicklime to reduce the concentration of SO2, reduce the pollution of SO2 to catalyst to improve the service life of catalyst, further improve the denitration efficiency of the SCR device, solve the problem that SO2 can cause the pollution of catalyst to make it ineffective, and then lead to the denitration efficiency reduction of SCR device.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] The utility model provides a kind of ship denitration dust removal's SCR device, including shell and the NO X waste gas inlet pipe and waste gas outlet that are respectively arranged in the both ends of shell, the side of the shell inside near NO X waste gas inlet pipe is equipped with catalytic module, the side of the shell inside near waste gas outlet is equipped with dust removal module.

[0008] Further, the outlet end of NO X waste gas inlet pipe is covered with guide vane, the edge of guide vane extends from the outlet end of NO X waste gas inlet pipe and forms extension guide vane in reverse direction, and extension guide vane and NO X waste gas inlet pipe outer wall form convection passage;The convection passage is communicated with waste gas inlet pipe;The catalytic module includes catalyst filling net arranged in convection passage, and NH3 nozzle for pointing to catalyst filling net in the waste gas counter current of NO X waste gas, and NH3 nozzle is used to spray ammonia gas to catalyst filling net;The catalyst filling net is filled with denitration catalyst, and NO X In waste gas is converted into harmless nitrogen and water vapor.Guide vane plays the role of flow guide, ensures that waste gas can flow according to predetermined path, and waste gas changes gas flow direction by guide vane and flows to the injection port of NH3.At this time, waste gas and NH3 form convection, increase the contact area of waste gas and NH3, and improve the removal efficiency of NO X .

[0009] Further, the edge of guide vane and the inner wall of shell, the outer wall of guide vane and the inner wall of shell are all equipped with interval to form curved flow passage, and the curved flow passage is communicated with convection passage and waste gas outlet respectively.

[0010] Further, the flow guide plate is in a bowl shape structure, covering the NO X The outlet end of the exhaust gas inlet pipe is outside the flow guide plate. The flow guide plate corresponds to the SCR device of the ring-shaped flow guide plate (see embodiment 1).

[0011] Further, the flow guide plate is in a symmetrically arranged bent plate shape structure, covering the NO X The outlet end of the exhaust gas inlet pipe is outside the flow guide plate, and the flow guide plate is a pair of inclined guide plates, which extend outward and forward from the connection between the guide plates. The flow guide plate corresponds to the SCR device of the plate-shaped flow guide plate (see embodiment 2). X The exhaust gas inlet pipe is axially symmetric to the center axis of the NO X The outlet end of the exhaust gas inlet pipe is directed to the connection between the guide plates, and the guide plates extend outward and forward from the connection. The flow guide plate corresponds to the SCR device of the plate-shaped flow guide plate (see embodiment 2).

[0012] Further, the side wall of the shell is composed of two pairs of opposite side walls, and the flow guide plate is connected to one pair of opposite side walls and is spaced apart from the other pair of opposite side walls.

[0013] Further, the guide plates are further connected with a baffle plate, and the NO X The outlet end of the exhaust gas inlet pipe is vertically directed to the baffle plate.

[0014] Further, the NO X The exhaust gas inlet pipe is provided with a quicklime filling net, and the flow guide plate and the extension thereof wrap the NO X The outlet end of the exhaust gas inlet pipe, the catalyst filling net, the quicklime filling net and the outlet end of the nozzle.

[0015] Further, the dust removal module is an electrostatic precipitator, and the mixed gas after reacting with NH3 flows to the electrostatic precipitator. The mixed gas passes through the electrostatic precipitator to remove a large amount of PM in the exhaust gas, so as to facilitate subsequent desulfurization treatment.

[0016] Further, the NO X The exhaust gas inlet pipe and the exhaust gas outlet are provided with an extension pipeline, and the NO X The extension pipeline of the exhaust gas inlet pipe is provided with an air inlet fan, and the extension pipeline of the exhaust gas outlet is provided with an air outlet fan.

[0017] In the utility model, the exhaust gas from the NO X The exhaust gas inlet pipe enters the SCR device, and is firstly preliminarily treated through the quicklime filling net, so that the SO2 concentration in the exhaust gas is greatly reduced. Then, the exhaust gas changes the gas flow direction through the flow guide plate and flows to the injection port of NH3. At this time, the exhaust gas and NH3 form a convection, the contact area of the exhaust gas and NH3 is increased, and the NO XThe removal efficiency of NOx. The exhaust gas in the catalyst filling net reacts with the sprayed ammonia gas to catalytically reduce NOx into harmless substances. Finally, after being cleaned by the electrostatic precipitator, the treated exhaust gas is discharged from the exhaust gas outlet, i.e. the exhaust gas flows through the NO X The exhaust gas inlet pipe, the quicklime filling net, the catalyst filling net, and then the electrostatic precipitator through the channel between the shell and the guide plate, so as to achieve the purpose of denitration and dust removal. The SCR device for ship denitration and dust removal realizes the effective removal of NOx in the exhaust gas and the dust removal treatment of particulate matters, and provides a powerful guarantee for the environmental protection operation of the ship.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1) In the utility model, most of the SO2 gas is removed in advance by using wet quicklime, which reduces the possibility of catalyst failure caused by SO2 pollution, thereby greatly prolonging the service life of the catalyst.

[0020] 2) The utility model utilizes the physical drainage mode to form a convection between the exhaust gas and NH3, thereby improving the contact area between the exhaust gas and NH3, and improving the removal efficiency of NO X , and after the reaction is completed, the PM in the exhaust gas is removed by the electrostatic precipitator to improve the removal efficiency of the subsequent SO2 treatment.

[0021] 3) The SCR device of the utility model has the advantages of simple structure, convenient operation, and multiple reuse, and has remarkable environmental and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a side view of the ship denitration and dust removal SCR device in embodiment 1.

[0023] Figure 2 It is a side view of the ship denitration and dust removal SCR device in embodiment 2.

[0024] Marking in the drawing:

[0025] 1-guide plate, 2-catalyst filling net, 3-shell, 4-NH3 nozzle, 5-quicklime filling net, 6-NO X exhaust gas inlet pipe, 7-electrostatic precipitator, 8-exhaust gas outlet, 9-guide plate, 10-baffle. DETAILED DESCRIPTION

[0026] The utility model will be described in detail in combination with the drawings and specific embodiments. The following embodiments are implemented on the basis of the above technical solutions of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0027] It should be noted that like reference numerals and characters refer to like items throughout the drawings and that once an item is defined in one drawing, it is not necessary to further define and explain it in the subsequent drawings.

[0028] Some embodiments of the present application will be described in detail with reference to the drawings. The following examples and features in the examples can be combined with each other in the case of no conflict.

[0029] In the following examples, unless otherwise specified, the raw materials or processing techniques are all conventional commercially available raw material products or conventional processing techniques in the art. Unless otherwise specified, the functional components or structures are all conventional components or conventional structures adopted in the art to achieve the corresponding functions.

[0030] Example 1:

[0031] The present embodiment provides a ship denitration dust removal SCR device, as shown in Figure 1 The shell 3 and a front and rear NO X The exhaust gas inlet pipe 6 and the exhaust gas outlet 8, the NO X The quicklime filling net 5 is arranged in the exhaust gas inlet pipe 6, the NO X The outlet end of the exhaust gas inlet pipe 6 is covered with a drain plate 1 in the form of a bowl structure, the edge of the drain plate 1 is self-NO X The outlet end of the exhaust gas inlet pipe 6 is reversely extended to form an extended drain plate, the extended drain plate is connected with the NO X The exhaust gas inlet pipe 6 forms a convection channel, the convection channel is connected with the exhaust gas inlet pipe 6; the drain plate 1 is a ring-shaped drain plate, a gap is arranged between the edge of the drain plate 1 and the inner wall of the shell 3, and between the outer wall of the drain plate 1 and the inner wall of the shell 3, to form a curved flow channel, the curved flow channel is connected with the convection channel and the exhaust gas outlet 8 respectively. The drain plate 1 and the extended part thereof wrap the NO X The outlet end of the exhaust gas inlet pipe 6, the catalyst filling net 2, the quicklime filling net 5, and the outlet end of the nozzle 4. The inner wall of the shell 3 is close to the NO X The exhaust gas inlet pipe 6 is provided with a catalytic module, and the inner wall of the shell 3 close to the exhaust gas outlet 8 is provided with a dust removal module.

[0032] The catalytic module includes a catalyst filling net 2 filled with a denitration catalyst in the convection channel, and an NH3 nozzle 4 penetrating through the shell 3 and pointing to the NO X The exhaust gas counterflows to the NH3 nozzle 4 of the catalyst filling net 2, and the catalyst filling net 2 removes the NO XThe NH3 nozzle is used to spray ammonia gas to the catalyst filling net 2. The guide plate 1 plays a role of guiding to ensure that the exhaust gas can flow along a predetermined path. The exhaust gas changes the gas flow direction through the guide plate 1 and flows to the injection port of NH3. At this time, the exhaust gas forms a convection with NH3, increases the contact area of the exhaust gas with NH3, and improves the removal efficiency of NO X .

[0033] The dust removal module is an electrostatic precipitator 7. The mixed gas after reacting with NH3 flows to the electrostatic precipitator 7. The mixed gas passes through the electrostatic precipitator 7 to remove a large amount of PM in the exhaust gas, so as to facilitate subsequent desulfurization treatment.

[0034] The exhaust gas inlet 9 and the exhaust gas outlet 8 are further provided with an extension pipeline. The extension pipeline of the exhaust gas inlet 9 is provided with an air inlet fan. The extension pipeline of the exhaust gas outlet 8 is provided with an air outlet fan.

[0035] The specific implementation process is as follows:

[0036] After the exhaust gas enters the device through the exhaust gas inlet 9, it first passes through the NO X The exhaust gas inlet pipe 6 and the quicklime filling net 5 are preliminarily treated, and most of SO2 in the gas is removed through the quicklime filling net 5. The exhaust gas is guided by the guide plate 1 and contacts NH3 sprayed by the NH3 nozzle 4 in the NO X Catalytic filling net 2, and a reaction occurs. At this time, the exhaust gas forms a convection with NH3, increases the contact area of the exhaust gas with NH3, and improves the removal efficiency of NO X . After the reaction is completed, the exhaust gas passes through the gap between the reaction device shell 3 and the guide plate 1 to the electrostatic precipitator 7, and PM in the exhaust gas is removed by the electrostatic precipitator 7, so as to facilitate subsequent other treatment. The exhaust gas with PM removed is discharged through the exhaust gas outlet 8.

[0037] Example 2:

[0038] The difference between this embodiment and example 1 is only that the NO X The guide plate 1 is a symmetrically arranged bent plate structure outside the outlet end of the exhaust gas inlet pipe 6, and specifically is a pair of inclined guide plates 9, as shown in Figure 2 The guide plates 9 are symmetrically arranged along the axial center axis of the exhaust gas inlet pipe 6. The guide plates 9 are further connected with a baffle plate 10. The NO X The exhaust gas inlet pipe 6 changes the gas flow direction through the guide plate 1 and flows to the injection port of NH3. At this time, the exhaust gas forms a convection with NH3, increases the contact area of the exhaust gas with NH3, and improves the removal efficiency of NO XThe outlet end of the exhaust gas inlet pipe 6 is vertically directed to the baffle 10. The guide plate 9 extends outwardly (towards the shell 3) and forwardly (towards the NH3 nozzle 4) from the connection with the baffle 10. The side wall of the shell 3 is formed by two pairs of opposite side walls, and the guide plate 1 is connected to one pair of the opposite side walls and is spaced apart from the other pair of the opposite side walls. The rest is the same as in the embodiment 1. In this way, the NO X The gas flowing into the outlet end of the exhaust gas inlet pipe 6 is surrounded by the guide plate 1, so that the gas is prevented from entering the electrostatic precipitator 7 in advance.

[0039] In the above embodiments, the provided SCR device improves the service life of the catalyst and the denitration efficiency by reducing the SO2 concentration and then removing the NO X The device uses the humid quicklime to pretreat the exhaust gas to reduce the SO2, and causes the exhaust gas and the NH3 to be in countercurrent by the physical guide plate, so as to increase the contact area and improve the removal efficiency of the NO X After the reaction, the exhaust gas is removed by the electrostatic precipitator to remove the PM, so as to improve the subsequent treatment efficiency.

[0040] The above description of the embodiments is for facilitating the ordinary skilled person in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without the need for creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A marine vessel de-NOx dedusting SCR device, characterized in that, The application relates to a NOx sensor, which comprises a shell (3) and a NOx sensor (4) arranged at one end of the shell (3) X The shell (3) is internally provided with a NOx sensor (4) and a dust removal module (5) near the NOx sensor (4) X The shell (3) is internally provided with a NOx sensor (4) and a dust removal module (5) near the NOx sensor (4) The catalytic module comprises a catalyst filling net (2) arranged in the counterflow channel, and a NO X An NH3 nozzle (4) is arranged to direct the exhaust gas countercurrently to the catalyst filling net (2) which is filled with a denitration catalyst. The dust removal module is an electrostatic dust collector (7).

2. Marine denitration and dust removal SCR device according to claim 1, characterized in that, The NO X The outlet end of the exhaust gas inlet pipe (6) is externally provided with a flow guide plate (1), and the edge of the flow guide plate (1) is provided with a NO X The outlet end of the exhaust gas inlet pipe (6) is externally provided with a flow guide plate (1), and the edge of the flow guide plate (1) is provided with a NO X The exhaust gas inlet pipe (6) is externally provided with a convection passage; and the convection passage is communicated with the exhaust gas inlet pipe (6).

3. Marine vessel de-NOx dedusting SCR device according to claim 2, characterized in that The edge of the flow guide plate (1) and the inner wall of the shell (3) are spaced apart, and the outer wall of the flow guide plate (1) and the inner wall of the shell (3) are also spaced apart, so as to form a curved flow channel, which is connected with the convection channel and the exhaust gas outlet (8) respectively.

4. The marine denitration and dust removal SCR device according to claim 2, characterized in that, The drainage plate (1) is in a bowl structure, which is covered on the NO X The outlet end of the exhaust gas inlet pipe (6) is outside.

5. The marine denitration and dust removal SCR device according to claim 2, characterized in that, The flow guide plate (1) is a symmetrically arranged bent plate structure, which is arranged on the NO X Outside the outlet end of the exhaust gas inlet pipe (6), the flow guide plate (1) is a pair of inclined guide vanes (9), which are arranged along the NO X The exhaust gas inlet pipe (6) is axially symmetric to the center axis, and the NO X The outlet end of the exhaust gas inlet pipe (6) points to the connection between the guide vanes (9), and the guide vanes (9) extend outward and forward from the connection.

6. Marine vessel de-NOx dedusting SCR device according to claim 5, characterized in that The side wall of the shell (3) is composed of two pairs of opposite side walls, and the flow guide plate (1) is connected with one pair of opposite side walls and is spaced apart from the other pair of opposite side walls.

7. The marine denitration and dust removal SCR device according to claim 5, characterized in that, Between the said deflectors (9) there are also baffles (10) connected to the said NO X The exhaust gas inlet pipe (6) is directed vertically towards the baffle (10) at its outlet end.

8. The marine denitration and dust removal SCR device according to claim 2, characterized in that, The NO X The exhaust gas inlet pipe (6) is provided with a quicklime filling net (5), and the drainage plate (1) and its extension part wrap the NO X The outlet end of the exhaust gas inlet pipe (6), the catalyst filling net (2), the quicklime filling net (5), and the outlet end of the nozzle (4).

9. The marine denitration and dust removal SCR device according to claim 1, characterized in that, The NO X The exhaust gas inlet pipe (6) and the exhaust gas outlet (8) are externally provided with extension pipes, and the NO X An air inlet fan is arranged on the extension pipe of the exhaust gas inlet pipe (6), and an exhaust fan is arranged on the extension pipe of the exhaust gas outlet (8).

Images