Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Automatic control method for large-flow seawater pump unit for ship exhaust gas cleaning

An automatic control and exhaust gas cleaning technology, applied in the field of ship exhaust gas, can solve the problems of wear and tear, large failures, multiple power sources, cumbersome work, etc., to reduce the use of electric power, ensure trouble-free time, and eliminate the effect of manual operation.

Active Publication Date: 2019-07-12
NANTONG NAVIGATION MACHINERY
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the amount of seawater entering the desulfurization tower is usually controlled by adjusting the opening of the diverter three-way valve, which can effectively treat the exhaust gas. However, the pump is always in the maximum operating state, which requires a lot of power consumption.
[0004] Because the state of the main engine of the ship is constantly changing, and the range of water flow required for exhaust gas treatment is also relatively large, the single-group PID algorithm can quickly, stably and accurately control the flow in a small range, but it cannot be guaranteed when the flow is adjusted by frequency conversion of the large-flow pump. Rapid and accurate response to changes in flow rate between 30-100%
[0005] The exhaust gas cleaning (EGC) system requires redundant configuration for the continuous operation of pumps. Generally, it will manually select which pump to start or automatically start the default main pump. When the running pump fails, it will automatically switch to another pump. Manual selection requires Manual judgment, there are many human factors; starting the main pump by default will cause the main pump to be basically in the running state, the probability of wear and failure is relatively high, and the other pump cannot perform its due function
[0006] When the flow meter fails, the three-way valve cannot be adjusted automatically because there is no flow feedback signal, and the three-way valve can only be adjusted manually to ensure the operation of the exhaust gas cleaning system (EGCS). cumbersome

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automatic control method for large-flow seawater pump unit for ship exhaust gas cleaning
  • Automatic control method for large-flow seawater pump unit for ship exhaust gas cleaning
  • Automatic control method for large-flow seawater pump unit for ship exhaust gas cleaning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] Such as Figure 1-2 As shown, this embodiment adopts the following technical solutions:

[0043] An automatic control method for a large-flow seawater pump set for ship exhaust gas cleaning, including preparation work, a space heater, a self-priming device, pump control and flow control.

[0044] Among them, the preparatory work mainly includes two steps. First, check the pipeline and valve parts, and then connect the two power sources.

[0045] Among them, the space heater is first turned to the on position, the space heater starts to run, and the pump is automatically cut off when it is running.

[0046] Among them, the self-priming device is first started before starting the pump, and the pump is restarted after a delay (the time is determined according to the self-priming effect); when the pressure is reached, the self-priming device stops working.

[0047] Among them, pump control includes manual control, automatic control and emergency stop;

[0048] 4.1. There...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an automatic control method for a large-flow seawater pump unit for ship exhaust gas cleaning. The automatic control method refers to the steps of preparing work, a space heater, a self-suction device, and pump control and flow control; the preparing work mainly comprises the two steps that firstly, a pipeline and a valve part are checked, secondly, two ways of power supplies are connected, the space heater is firstly started to the started position and starts to operate, and the space heater is automatically cut off when a pump operates. According to the automatic control method for the large-flow seawater pump unit for ship exhaust gas cleaning, the frequency of a pump motor is adjusted automatically in a frequency conversion mode according to the state of a mainmachine, thus using of electric power is reduced, and electric energy sources are effectively saved; automatic adjusting is conducted through a multi-stage PI algorithm, and it is ensured that the flow of each stage can be quickly and accurately responded; automatic judging control is conducted, the situation that a certain pump operates for a long term all the time and the other pump is rarely used is avoided, and the trouble-free time of the overall system is ensured; and when a flow meter breaks down, flow adjusting is automatically tracked, and manual operation is omitted.

Description

technical field [0001] The invention belongs to the technical field of ship exhaust gas, in particular to an automatic control method for a large-flow seawater pump set for cleaning ship exhaust gas. Background technique [0002] According to the International Maritime Organization (IMO), according to the MEPC.259(68) resolution on sulfur restrictions for ships in global sea areas, starting from January 1, 2020, ships sailing around the world can only use fuel oil with a sulfur content of no more than 0.5%. One of the effective methods for sulfur oxide emissions is to install an exhaust gas cleaning system (EGCS) for treatment. Regardless of whether desulfurization is added in the desulfurization process or seawater is directly used, the water pump is crucial in the entire system. The main engine of the ship is in different The running state produces different amounts of exhaust gas, that is, the amount of water required to treat ship exhaust gas is also different. This cont...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/163
Inventor 魏戴宁于可陆健
Owner NANTONG NAVIGATION MACHINERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products