CN101104130A - Device and method for seawater washing treatment of ship exhaust gas - Google Patents

Abstract

The device and method for washing ship tail gas with seawater according to the invention belong to the technical field of ship tail gas treatment. In the hollow fiber membrane contactor used as a scrubber, seawater washing treatment is performed on the ship tail gas that has undergone dust removal pretreatment. The control system composed of SO ₂ concentration monitor, water quality monitor and PLC programmable controller realizes the post-treatment Real-time detection and storage of SO ₂ concentration in ship exhaust, waste water quality and control of discharge. The beneficial effects of the present invention are: the hollow fiber membrane contactor is used as the scrubber, which requires less water and can effectively remove sulfur oxides and particulate matter in the exhaust gas of the ship; the treatment effect of the exhaust gas and seawater by the PLC Real-time monitoring, collection and storage for port state inspection.

Description

Device and method for seawater washing treatment of ship exhaust gas

technical field

The invention relates to the technical field of ship tail gas treatment, in particular to a device and method for washing ship tail gas with seawater.

Background technique

Most of the existing ocean-going ships use heavy fuel oil as fuel, and its combustion products, namely ship exhaust, contain a large amount of harmful gases, such as carbon dioxide, nitrogen oxides, sulfur oxides, etc. If these harmful gases are not treated, they will be directly Emissions will pollute the atmosphere and cause many harms to the natural environment. In order to effectively reduce the pollution caused by ship exhaust to the atmosphere, the International Maritime Organization (IMO) has formulated Annex VI of the MARPOL Convention, which regulates the emissions of nitrogen oxides and sulfur oxides in ship exhaust.

There are many existing technologies for treating ship exhaust. Among them, the treatment technologies of nitrogen oxides mainly include combustion treatment and selective catalytic reduction; the treatment technologies of sulfur oxides include pre-treatment technology using low-sulfur fuel oil and dry method. Post-treatment technology for desulfurization/seawater washing. However, most of the existing scrubbers for seawater washing treatment use nozzles to directly spray water. This seawater washing treatment process has poor treatment effect and high energy consumption.

Contents of the invention

The purpose of the present invention is to provide a device and method for washing ship tail gas with seawater, which can effectively remove sulfur oxides and particulate matter in ship tail gas, and can also monitor, collect and store the treatment effect of ship tail gas and seawater in real time , to facilitate port state inspection.

In order to achieve the above object, technical scheme of the present invention is as follows:

The device for seawater washing treatment of ship exhaust gas is mainly composed of seawater pump 1, electromagnetic flowmeter 2, hollow fiber membrane contactor 3, electrostatic precipitator 4, axial flow fan 5, solid-liquid cyclone separator 6, and _SO2 concentration monitoring Instrument 7, PLC programmable controller 8, water quality monitor 9 and solenoid valve 10, seawater pump 1 is connected to electromagnetic flowmeter 2 through steel pipe, electromagnetic flowmeter 2 is connected to seawater inlet of hollow fiber membrane contactor 3 through steel pipe, The electrostatic precipitator 4 is connected to the axial flow fan 5 through an aluminum alloy tube for pretreatment of ship exhaust; the axial flow fan 5 is connected to the gas inlet of the hollow fiber membrane contactor 3 through an aluminum alloy tube for the pretreated The exhaust gas from the ship is input into the hollow fiber membrane contactor 3; the _SO2 concentration monitor 7 is connected to the gas outlet of the hollow fiber membrane contactor 3 through a steel pipe, and is used to monitor the concentration of _SO2 in the treated ship exhaust gas and transmit the monitoring results To the PLC programmable controller 8; the solid-liquid cyclone separator 6 is connected to the seawater outlet of the hollow fiber membrane contactor 3 through a steel pipe, and is used to separate oil residue and water from the seawater flowing out of the hollow fiber membrane contactor 3; The water quality monitor 9 is connected with the solid-liquid cyclone separator 6 through a steel pipe, and is used to monitor the water quality of the seawater treated by the solid-liquid cyclone separator 6, and transmit the monitoring results to the PLC programmable controller 8; the PLC programmable The controller 8 is connected with the _{SO2concentration} monitor 7, the water quality monitor 9, and the solenoid valve 10 respectively, and is used for real-time detection and storage of the monitoring signals transmitted by the _{SO2concentration} monitor 7 and the water quality monitor 9, and according to the detected water quality The monitoring signal controls the action of the solenoid valve 10; the solenoid valve 10 is connected to the water quality monitor 9 through a steel pipe, and is used to control the flow of seawater flowing through the water quality monitor 9.

The hollow fiber material in the hollow fiber membrane contactor 3 is polypropylene, and is woven into a fiber fabric.

The method for washing ship tail gas with seawater comprises the following steps: sea water flows through a sea water pump 1 through an electromagnetic flowmeter 2 and is pumped into a hollow fiber membrane contactor 3, and ship tail gas is pretreated by an electrostatic precipitator 4 and then passed through an axial flow fan 5 is input into the hollow fiber membrane contactor 3; in the hollow fiber membrane contactor 3, seawater washes the exhaust gas of the ship; the _SO2 concentration monitor 7 monitors the _SO2 concentration of the washed ship exhaust gas, and reports the monitoring results Sent to the PLC programmable controller 8; the solid-liquid cyclone separator 6 performs solid-liquid separation treatment on the seawater flowing out of the hollow fiber membrane contactor 3, and discharges the separated oil residue into the oil residue tank 11; the water quality monitor 9 Monitor the water quality of the seawater separated by the solid-liquid cyclone separator 6, and transmit the monitoring results to the PLC programmable controller 8; the PLC programmable controller 8 stores the monitoring data transmitted by the _SO2 concentration monitor 7 and the water quality monitor 9 As a result, and according to the received water quality monitoring results, the solenoid valve 10 is controlled to discharge seawater into the bilge well 12 or the sea.

The beneficial effects of the present invention are as follows: the hollow fiber membrane contactor is used as the washing container, which requires less water and can effectively remove sulfur oxides and particulate matter in the tail gas of the ship; the treatment effect of the tail gas of the ship and seawater by the PLC programmable controller Real-time monitoring, collection and storage for port state inspection.

Description of drawings

Fig. 1 is a schematic diagram of a device for washing ship tail gas with seawater according to the present invention.

In the figure: 1. Seawater pump, 2. Electromagnetic flowmeter, 3. Hollow fiber membrane contactor, 4. Electrostatic precipitator, 5. Axial flow fan, 6. Solid-liquid cyclone separator, 7. _SO2 concentration monitor , 8, PLC programmable controller, 9, water quality monitor, 10, solenoid valve, 11, oil residue tank, 12, cabin sewage well.

Detailed ways

The present invention is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, the device of the present invention that carries out seawater washing treatment to ship tail gas mainly consists of seawater pump 1, electromagnetic flow meter 2, hollow fiber membrane contactor 3, electrostatic precipitator 4, axial flow fan 5, solid-liquid cyclone Flow separator 6, _SO2 concentration monitor 7, PLC programmable controller 8, water quality monitor 9 and solenoid valve 10.

After being pretreated by the electrostatic precipitator 4, the exhaust gas from the ship chimney is sent to the fiber tube of the hollow fiber membrane contactor 3, that is, the scrubber, through the axial flow fan 5. In the scrubber, the exhaust gas from the ship is scrubbed by seawater. The seawater used for washing ship exhaust is pumped into the scrubber after being metered by the electromagnetic flowmeter 2 by a special seawater pump 1 .

The washed ship tail gas flows through the SO2 concentration monitor 7 and is finally discharged into the atmosphere. The SO2 concentration monitor 7 transmits the monitored SO2 concentration in the washed ship tail gas to the PLC programmable controller 8 in real time.

The seawater flows from top to bottom outside the fiber tube of the hollow fiber membrane contactor 3, becomes waste water at the outlet of the seawater, and flows to the solid-liquid cyclone separator 6, and the solid-liquid cyclone separator 6 treats the solid particles in the waste water The impurities are separated, and the separated impurities are sent to the oil residue tank 7, and the clean wastewater flows through the water quality monitor 9 for monitoring. The water quality monitor 9 is composed of an industrial pH meter and an oil concentration monitoring device. The water quality monitoring instrument 9 transmits the water quality monitoring results to the PLC programmable controller 8 in real time. If the water quality detected by the water quality monitor 9 meets the requirements, that is, the pH is 7-8, and the oil concentration is less than 5ppm, then the PLC programmable controller 8 sends a signal to control the action of the solenoid valve 10, and the clean waste water is pumped in by the seawater pump 1 The seawater is diluted and discharged into the sea; if the water quality detected by the water quality monitor 9 exceeds the standard, that is, the pH<7 and the oil concentration>5mg/L, the PLC programmable controller 8 sends a signal to control the action of the solenoid valve 10, and the clean wastewater is sent to the sea. Enter the cabin sewage well 12 for processing.

During the above-mentioned washing process, all the monitoring results are transmitted to the PLC programmable controller 8 in real time, so that technicians can store and print the monitoring data conveniently.

Claims (3)

1. ship tail gas is carried out the device that seawer washing is handled, it is characterized in that this installs mainly by sea water pump (1), electromagnetic flowmeter (2), hollow fiber membrane contactors (3), electrostatic precipitator (4), axial flow blower (5), solid-liquid cyclone separator (6), SO ₂Concentration monitor (7), PLC Programmable Logic Controller (8), water quality monitor (9) and magnetic valve (10) are formed, sea water pump (1) is connected with electromagnetic flowmeter (2) by steel pipe, electromagnetic flowmeter (2) is connected with the seawater inlet of hollow fiber membrane contactors (3) by steel pipe, electrostatic precipitator (4) is connected with axial flow blower (5) by aluminium-alloy pipe, is used for ship tail gas is carried out preliminary treatment; Axial flow blower (5) is connected with hollow fiber membrane contactors (3) gas access by aluminium-alloy pipe, is used in the pretreated ship tail gas input hollow fiber membrane contactors (3); SO ₂Concentration monitor (7) is connected by the gas vent of steel pipe with hollow fiber membrane contactors (3), is used for monitoring the ship tail gas SO after the processing ₂Concentration, and send monitoring result to PLC Programmable Logic Controller (8); Solid-liquid cyclone separator (6) is connected by the seawer outlet of steel pipe with hollow fiber membrane contactors (3), is used for carrying out from the seawater that hollow fiber membrane contactors (3) flows out separating of the dregs of fat and water; Water quality monitor (9) is connected with solid-liquid cyclone separator (6) by steel pipe, is used for the water quality of the seawater of monitoring after solid-liquid cyclone separator (6) is handled, and sends monitoring result to PLC Programmable Logic Controller (8); PLC Programmable Logic Controller (8) respectively with SO ₂Concentration monitor (7), water quality monitor (9), magnetic valve (10) connect, and are used for detecting in real time and storage SO ₂The monitor signal that concentration monitor (7) and water quality monitor (9) transmit, and move according to detected water quality monitoring signal controlling magnetic valve (10); Magnetic valve (10) is connected with water quality monitor (9) by steel pipe, is used for the flow through flow direction of seawater of water quality monitor (9) of control.

2. the device that ship tail gas is carried out the seawer washing processing as claimed in claim 1 is characterized in that the doughnut material in the described hollow fiber membrane contactors (3) is to weave into the polypropylene of fabric.

3. ship tail gas is carried out the method that seawer washing is handled, it is characterized in that, this method comprises the steps: that seawater passes through sea water pump (1) electromagnetic flowmeter (2) of flowing through and pumps in the hollow fiber membrane contactors (3), ship tail gas after electrostatic precipitator (4) preliminary treatment by in axial flow blower (5) the input hollow fiber membrane contactors (3); In hollow fiber membrane contactors (3), seawater carries out carrying out washing treatment to ship tail gas; SO ₂Concentration monitor (7) carries out SO to the ship tail gas after the carrying out washing treatment ₂Concentration monitor, and send monitoring result to PLC Programmable Logic Controller (8); Solid-liquid cyclone separator (6) carries out Separation of Solid and Liquid to the seawater that flows out in the hollow fiber membrane contactors (3) to be handled, and the isolated dregs of fat are entered dregs of fat cabinet (11); Water quality monitor (9) carries out water quality monitoring to the isolated seawater of solid-liquid cyclone separator (6), and sends monitoring result to PLC Programmable Logic Controller (8); PLC Programmable Logic Controller (8) storage SO ₂The monitoring result that concentration monitor (7) and water quality monitor (9) transmit, and according to the water quality monitoring result who receives, control magnetic valve (10) enters cabin bilge well (12) or marine greatly with seawater.

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