阅读说明：本技术 一种船用柴油机模块式scr催化器 (Modular SCR (selective catalytic reduction) catalyst of marine diesel engine ) 是由 陆文锦 周亚娟 孙靖圻 于 2018-06-26 设计创作，主要内容包括：一种船用柴油机模块式SCR催化器,是由进气模块、连接风管、催化模块和排气模块组成,连接处垫密封垫后,用螺栓连接成一体；所述进气模块是由导流器、法兰组件、标准套件、尿素喷射口、进气模块外壳、管道法兰、加热管焊接而成,导流器为5个方锥形钣金件,使柴油机排出的烟气散开,尿素从尿素喷射口喷入,热空气从加热管进入,对烟气加热至400℃左右,可使催化处理处于最佳状态；烟气加热后经过连接风管,通向催化模块,所述催化模块是由催化陶瓷块组件、催化模块框架、限位筋板和隔热层组装后焊接而成；所述出口模块是由管道法兰、温度传感器座、NOX传感器座管道、法兰组件焊接而成；催化陶瓷块需要经常更换,采用模块式设计,大大方便了安装和维修。(A modular SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an air inlet module, a connecting air pipe, a catalyst module and an exhaust module, wherein a sealing gasket is arranged at the connecting part of the SCR catalyst and the connecting air pipe, and the SCR catalyst and the exhaust module are connected into a whole by bolts; the air inlet module is formed by welding a fluid director, a flange component, a standard kit, a urea injection port, an air inlet module shell, a pipeline flange and a heating pipe, wherein the fluid director is 5 square conical sheet metal parts, so that smoke discharged by the diesel engine is dispersed, urea is injected from the urea injection port, hot air enters from the heating pipe, and the hot air heats the smoke to about 400 ℃, so that the catalytic treatment can be in an optimal state; the flue gas is heated and then is led to a catalytic module through a connecting air pipe, and the catalytic module is formed by assembling and welding a catalytic ceramic block assembly, a catalytic module frame, a limiting rib plate and a heat insulation layer; the outlet module is formed by welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly; the catalytic ceramic block needs to be frequently replaced, and the modular design is adopted, so that the installation and the maintenance are greatly facilitated.)

1. A modular SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module, a connecting air pipe, a catalyst module and an outlet module, wherein a sealing gasket is arranged at a plane connecting part and then is connected into a whole by bolts; the inlet module is formed by welding a fluid director, a flange assembly, a standard kit, a urea injection port, an air inlet module shell, a pipeline flange and a heating pipe; the connecting air pipe is formed by welding a flange component and an air pipe shell; the catalytic module is formed by assembling and welding a catalytic ceramic block assembly, a catalytic module frame, a limiting rib plate and a heat insulation layer; the outlet module is formed by welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly.

Technical Field

The invention relates to the technical field of environmental protection, in particular to the technical field of emission reduction of tail gas of a marine diesel engine.

Background

According to the specification of the MARPOL international convention VI, the tail gas emission of a diesel engine in an emission control area is required to reach the specification of the Tier III emission standard, and the emission of NOX in the Tier III standard is reduced by 76.4 percent compared with the Tier II standard, so that the emission of the diesel engine reaches the standard when a new ship is manufactured.

Disclosure of Invention

When the catalyst carrier is replaced, the whole catalyst carrier is not required to be disassembled and assembled, and only the part needing to be replaced is disassembled and replaced, so that the maintenance time is greatly shortened.

A modular SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module, a connecting air pipe, a catalyst module and an outlet module, wherein a sealing gasket is arranged at a plane connecting part and then is connected into a whole by bolts; the inlet module is formed by welding a fluid director, a flange assembly, a standard kit, a urea injection port, an air inlet module shell, a pipeline flange and a heating pipe; the connecting air pipe is formed by welding a flange component and an air pipe shell; the catalytic module is formed by assembling and welding a catalytic ceramic block assembly, a catalytic module frame, a limiting rib plate and a heat insulation layer; the outlet module is formed by welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly.

Drawings

FIG. 1 is a schematic structural diagram of a modular SCR catalyst of a marine diesel engine

In the figure: the inlet module (1) is connected with the air pipe (2), the carrier of the catalytic module (3) can disperse the active components on the surface of the carrier to obtain higher specific surface area and improve the catalytic efficiency of the active components per unit mass, and the outlet module (4) A represents the air flow direction;

FIG. 2 is a schematic view of the structure of the inlet module (1)

In the figure: the device comprises a fluid director (1-1), a flange component (1-2), a standard kit (1-3), a urea injection port (1-4), an inlet module shell (1-5), a pipeline flange (1-6) and a heating pipe (1-7);

FIG. 3 is a schematic view of the structure of the connecting air duct (3)

In the figure: the flange assembly (2-1) and the air pipe shell (2-2);

FIG. 4 is a front view of the catalytic module (3)

In the figure: the device comprises a catalytic ceramic block assembly (3-1), a catalytic module frame (3-2), a limiting rib plate (3-3) and a heat insulation layer (3-4);

FIG. 5 is a sectional view A-A of the catalyst module (3)

In the figure: the device comprises a catalytic ceramic block assembly (3-1), a catalytic module frame (3-2) and a limiting rib plate (3-3);

FIG. 6 is an axial side view of the catalytic module (3)

In the figure: the device comprises a catalytic ceramic block assembly (3-1), a catalytic module frame (3-2), a limiting rib plate (3-3) and a heat insulation layer (3-4);

FIG. 7 is a partial enlarged view of the portion I in FIG. 6

In the figure: the device comprises a catalytic ceramic block assembly (3-1), a limiting rib plate (3-3) and a heat insulation layer (3-4);

FIG. 8 is a schematic view of the structure of the outlet module (4)

In the figure: the device comprises a pipeline flange (4-1), a temperature sensor seat (4-2), an NOX sensor seat (4-3), a pipeline (4-4) and a flange assembly (4-5);

Detailed Description

A modular SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module (1), a connecting air pipe (2), a catalytic module (3) and an outlet module (4), wherein sealing gaskets are arranged at the connecting parts and then are connected into a whole by bolts; the inlet module is formed by welding a fluid director (1-1), a flange component (1-2), a standard suite (1-3), a urea jet orifice (1-4), an inlet module shell (1-5), a pipeline flange (1-6) and a heating pipe (1-7), wherein the fluid director is formed by welding 5 square conical sheet metal parts, so that smoke discharged by the diesel engine is dispersed, urea is sprayed from the urea jet orifice, hot air enters from the heating pipe, and the smoke is heated to about 400 ℃, so that the catalytic treatment can be in the optimal state; after being heated, the flue gas passes through a connecting air pipe and is led to a catalytic module (3), the catalytic module is formed by assembling and welding a catalytic ceramic block assembly (3-1), a catalytic module frame (3-2), a limiting rib plate (3-3) and a heat insulation layer (3-4), and the catalytic ceramic carrier can disperse active components on the surface of the carrier, so that a higher specific surface area is obtained, and the catalytic efficiency of the active components per unit mass is improved; the outlet module (4) is formed by welding a pipeline flange (4-1), a temperature sensor seat (4-2), an NOX sensor seat pipeline (4-3) and a flange assembly (4-4); the catalytic ceramic block needs to be frequently replaced, the modular design is adopted, the installation and the maintenance are greatly facilitated, when a catalytic ceramic block component carrier is replaced, the whole assembly and disassembly are not needed, only the replacement part needs to be disassembled for replacement, the maintenance time is greatly shortened, and the principle and the process of treating smoke are the same as those of an original catalytic silencer.