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Control device for waste heat recovery system

A technology of waste heat recovery and control device, applied in muffler device, exhaust device, steam engine device, etc., can solve problems such as time-consuming for stable power supply, no record of power frequency change, power frequency change, etc., so as to improve the response performance, reducing power frequency fluctuations, and improving responsiveness

Active Publication Date: 2013-07-17
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the power frequency may fluctuate greatly due to the responsiveness of the steam turbine output control
[0011] Therefore, when the load in the ship decreases sharply, it is necessary to consider fluctuations in the power frequency, but Patent Document 2 does not describe any fluctuations in the power frequency.
In addition, when the power of the ship's internal load decreases sharply, it may take time for the power supply to stabilize due to the difference in response speed when controlling the output of the power turbine and steam turbine.

Method used

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  • Control device for waste heat recovery system
  • Control device for waste heat recovery system
  • Control device for waste heat recovery system

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0044] First, refer to figure 1 The structure of the waste heat recovery system of this invention is demonstrated. figure 1 The waste heat recovery system shown includes: an engine 22 that propels the ship; a propeller 30 that is rotated by the output of the engine 22; a supercharger 21 that compresses air supplied to the engine 22; Chilled cooler 31 ; power turbine (gas turbine) 23 ; steam turbine 26 ; generator 28 .

[0045] The power turbine 23, the steam turbine 26, and the generator 28 are connected through reducers 24, 27 having intermeshing gears of different sizes and numbers of teeth. Furthermore, the rotating shafts among the power turbine 23 , the steam turbine 26 , and the generator 28 are connected via a clutch 25 so that the rotating power can be transmitted or blocked.

[0046] In addition, the exhaust heat recovery system further includes an exhaust gas economizer 150, the exhaust gas discharged from the engine 22 is supplied to the exhaust gas economizer v...

no. 2 approach

[0066] refer to Figure 5 , 6 The control logic performed by the control device of the waste heat recovery system of the second embodiment will be described. Figure 5 is a block diagram showing the control logic performed by the control device of the waste heat recovery system according to the second embodiment, Image 6 It is a flowchart of the control logic of the second embodiment. in addition, Figure 5 , 6 The control valve B controlling the power generation of the power turbine is discussed.

[0067] In this embodiment, instead of controlling the power turbine and the steam turbine independently, a control algorithm for cooperatively controlling them is constructed. Because the response of the steam system usually lags behind, the steam turbine is mainly controlled, and the power turbine is used as an auxiliary to make it work and generate a power turbine command.

[0068] Specifically, in Figure 5 In the control logic of , after step S11 is started, in step S12...

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Abstract

Disclosed is a control device for a waste heat recovery system which enables improvement in the responsiveness of the output control for a power turbine and a steam turbine with respect to sudden changes in the inboard load. The control device for a waste heat recovery system is equipped with: a power turbine that provides drive using engine exhaust gas and a steam turbine that provides drive using steam generated with an engine exhaust gas economizer, and is equipped with a power turbine control means which controls the output of the power turbine and a steam turbine control means which controls the output of the steam turbine, and both of which drive an electrical generator by means of the power turbine and the steam turbine. The power turbine control means is equipped with: a power turbine feedback control means which calculates a control valve operation amount based on the deviation between a power turbine target value a;nd the actual power turbine output; and a power turbine feed-forward control means which extracts a control valve operation amount from a power turbine degree-of-opening command map wherein the relationship between the engine load, the power turbine output target value calculated from the engine load, and the control valve operation amount has been preset. The power turbine control means sets the degree of opening of the control valve by adding the operation amount from the feed-forward control means and the operation amount from the feedback control means.

Description

technical field [0001] The present invention relates to a control device for a waste heat recovery system for ships, and more particularly, to a control device for a waste heat recovery system that sets the opening degree of a control valve based on calculations performed by a PID controller and the rotational speed deviation of a power turbine. Background technique [0002] At present, as a waste heat recovery system for ships, it is known that an exhaust gas economizer is installed to utilize the exhaust gas of the engine, and the heat exchange with the heat of the exhaust gas generated by the main engine of the ship is performed to drive the steam turbine to generate electricity. A system that installs a shaft generator on board and uses the output of the engine to rotate the shaft generator to provide electric power for the loads in the ship. Such a waste heat recovery system has been proposed and disclosed in, for example, Patent Document 1 (Japanese Unexamined Patent P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B41/10B63H21/14B63J3/02F01K23/02F02G5/02
CPCY02T10/16F01K13/02F01N5/04F02B37/00F01N2590/02Y02T70/5281F02B41/10B63J3/02B63H21/32Y02T10/163F01K23/101F01N5/02Y02P80/15Y02T10/12Y02T70/50B63H21/14F01K23/02
Inventor 坂口佑介市来芳弘金星隆之太田裕二键本良实
Owner MITSUBISHI HEAVY IND LTD