阅读说明：本技术 一种船用柴油机复合排烟式scr催化器 (Marine diesel engine composite smoke-discharging SCR (Selective catalytic reduction) catalyst ) 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：一种船用柴油机复合排烟式SCR催化器,是由进口模块、阀门模块、催化模块、出口模块和控制系统组成,用螺栓将进口模块、阀门模块、催化模块、出口模块连接成一体；进口模块是由导流器、法兰组件、标准套件、尿素喷射口、进口模块外壳、管道法兰、加热管焊接而成,导流器为5个方锥形钣金件焊接而成；阀门模块由法兰组件、外壳、阀片轴、拉板、连接销、双作用油缸组成,双作用油缸C、D二个接口与控制系统油管相连接；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；出口模块是由管道法兰、温度传感器座、NOX传感器座管道、法兰组件组装焊接而成；控制系统由控制箱、二位四通电磁阀、油箱、油泵组成,通过控制液压系统,来控制阀门开启和关闭。(A composite smoke-discharging SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module, a valve module, a catalytic module, an outlet module and a control system, wherein the inlet module, the valve module, the catalytic module and the outlet module are 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 inlet module shell, a pipeline flange and a heating pipe, wherein the fluid director is formed by welding 5 square conical sheet metal parts; the valve module consists of a flange component, a shell, a valve sheet shaft, a pulling plate, a connecting pin and a double-acting oil cylinder, wherein two interfaces C, D of the double-acting oil cylinder are connected with an oil pipe of a control system; 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 assembling and welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly; the control system consists of a control box, a two-position four-way electromagnetic valve, an oil tank and an oil pump, and the opening and the closing of the valve are controlled by controlling the hydraulic system.)

1. A composite smoke-discharging SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module, a valve module, a catalytic module, an outlet module and a control system, wherein the inlet module, the valve module, the catalytic module and the outlet module are connected into a whole by bolts; the inlet module is formed by welding a fluid director, a flange assembly, a standard kit, a urea jet orifice, an inlet module shell, a pipeline flange and a heating pipe; the valve component is formed by welding and assembling a flange component, a shell, a valve plate shaft, a pulling plate, a connecting pin and a double-acting oil cylinder; 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 exhaust module is formed by welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly, the control system is formed by assembling a control box, a two-position four-way electromagnetic valve, an oil tank and an oil pump, and the control valve is opened or closed.

Technical Field

The invention relates to the technical field of environmental protection, in particular to the technical field of emission reduction of marine diesel engines.

Background

According to the regulations in the MarPOL international convention attached convention VI, in a ship built after No. 1/2016, in an emission control area, the tail gas emission of a diesel engine must reach the Tier III emission standard, the emission of NOX in the Tier III standard is reduced by 76.4 percent compared with that in the Tier II standard, and the emission of the diesel engine reaches the standard imperatively when a new ship is manufactured. The catalytic reduction (SCR) technology is a process for treating Nitrogen Oxides (NOX) in the exhaust gas of diesel engines, i.e. under the action of a catalyst, a reducing agent ammonia or urea is injected to reduce NOX in the exhaust gas into N2 and H2O, thereby reducing the emission of NOX. International laws stipulate that an ocean-going carrier must start the SCR aftertreatment device in the offshore 80 sea. In order to save expenses and reduce operation cost, operators stop using the SCR system in random sea areas, so the SCR device is installed on a bypass pipe to complete SCR post-treatment, and the bypass pipe occupies a large space.

Disclosure of Invention

The SCR catalytic converter is controlled by opening or closing the control valve, and adopts a straight-through design without a bypass pipe, so that the SCR catalytic converter is compact in structure and saves space.

A composite smoke-discharging SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module, a valve module, a catalytic module, an outlet module and a control system, wherein the inlet module, the valve module, the catalytic module and the outlet module are connected into a whole by bolts; the inlet module is formed by welding a fluid director, a flange assembly, a standard kit, a urea jet orifice, an inlet module shell, a pipeline flange and a heating pipe; the valve component is formed by welding and assembling a flange component, a shell, a valve plate shaft, a pulling plate, a connecting pin and a double-acting oil cylinder; 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 exhaust module is formed by welding a pipeline flange, a temperature sensor seat, an NOX sensor seat pipeline and a flange assembly, the control system is formed by assembling a control box, a two-position four-way electromagnetic valve, an oil tank and an oil pump, and the control valve is opened or closed;

drawings

FIG. 1 is a composite smoke-discharging SCR catalyst of a marine diesel engine

In the figure: the device comprises an inlet module (1), a valve module (2), a catalytic module (3), an outlet module (4) and a control system (5), wherein A represents the airflow 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 fastener (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 structural view of the valve module (2)

In the figure: two interfaces, namely a flange component (2-1), a shell (2-2), a valve shaft (2-3), a pulling plate (2-4), a connecting pin (2-5), a double-acting oil cylinder (2-6) and C, D, are connected with an oil pipe of a control system;

FIG. 4 is an isometric view of the valve module (3)

In the figure: the smoke exhaust fire prevention valve comprises a flange assembly (2-1), a shell (2-2), a valve sheet shaft (2-3), a pulling plate (2-4), a connecting pin (2-5), peripheral valve sheets and a middle valve sheet, wherein the peripheral valve sheets and the middle valve sheet are welded on the valve sheet shaft, and each valve sheet is hot-riveted with stainless steel sheets up and down in the full length range and used for sealing and has the same structure as the smoke exhaust fire prevention valve; the two interfaces of the double-acting oil cylinder (2-6) and C, D are connected with an oil pipe of a control system, when the piston rod moves upwards, the valve plates (2-7) on the periphery are gradually opened, the middle valve plates (2-8) are gradually closed, otherwise, when the piston rod moves downwards, the valve plates (2-7) on the periphery are gradually closed, and the middle valve plates (2-8) are gradually opened;

FIG. 5 is a control system schematic

In the figure: the double-acting oil cylinder (2-6) and C, D are connected with an oil pipe of a control system, the control box (5-1) controls the opening and closing of a valve plate by controlling a hydraulic system, and the double-acting oil cylinder comprises a two-position four-way electromagnetic valve (5-2), an oil tank (5-3) and an oil pump (5-4);

FIG. 6 is a front view of the catalytic module (3)

In the figure: the catalytic ceramic module assembly (3-1), the catalytic module frame (3-2), the limiting rib plate (3-3), the heat-insulating layer (3-4), the middle is a channel, and the catalytic ceramic module assembly is used when exhaust gas is not treated;

FIG. 7 is a sectional view A-A of the catalyst module (3)

In the figure: the catalytic ceramic module assembly (3-1), the catalytic module frame (3-2), the limiting rib plate (3-3), the middle is a channel, and the catalytic ceramic module assembly is used when exhaust gas is not treated;

FIG. 8 is an axial view of the catalytic module (3)

In the figure: the catalytic ceramic block assembly (3-1), the catalytic module frame (3-2), the limiting rib plate (3-3), and the middle of the thermal insulation layer (3-4) is a channel, and the channel is used when exhaust gas is not treated;

FIG. 9 is a partial enlarged view of the portion I in FIG. 8

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. 10 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 (4-2), an NOx sensor (4-3), a pipeline (4-4) and a flange component (4-5);

Detailed Description

A composite smoke-discharging SCR (selective catalytic reduction) catalyst for a marine diesel engine consists of an inlet module (1), a valve module (2), a catalytic module (3), an outlet module (4) and a control system (5), wherein the inlet module, the valve module, the catalytic module and the outlet module are connected into a whole by bolts; the inlet module is formed by welding a fluid director (1-1), a flange assembly (1-2), a fastener (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; the valve module consists of a flange component (2-1), a shell (2-2), a valve sheet shaft (2-3), a pulling plate (2-4), a connecting pin (2-5) and a double-acting oil cylinder (2-6), wherein two interfaces A, B of the double-acting oil cylinder are connected with an oil pipe of a control system;

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); the outlet module (4) is formed by assembling and welding a pipeline flange (4-1), a temperature sensor seat (4-2), an NOX sensor seat pipeline (4-3) and a flange component (4-4), 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 control system consists of a control box (5-1), a two-position four-way electromagnetic valve (5-2), an oil tank (5-3) and an oil pump (5-4), wherein two ports C, D are connected with two ports C, D of a double-acting oil cylinder (2-6); the opening and closing of the air door are controlled by controlling a hydraulic system; when the piston rod moves upwards, the air doors (2-7) on the periphery are gradually opened, and the middle valve plates (2-8) are gradually closed, otherwise, when the piston rod moves downwards, the valve plates (2-7) on the periphery are gradually closed, and the middle valve plates (2-8) are gradually opened; namely, when the ocean transport ship is near the coast 80 seas, the flue gas passes through the periphery to carry out SCR post-treatment on the flue gas, and when the ocean transport ship exceeds the coast 80 seas, the flue gas passes through the middle to carry out SCR post-treatment on the flue gas. During assembly, attention is paid to the fit of the adjusting valve plate and the shell so as to reduce air leakage.

The double-acting oil cylinder can be replaced by a double-acting air cylinder or a double-acting electric cylinder. The principle and the process of treating the flue gas are the same as those of the original catalytic muffler.