Heat energy recovery system

Patent metadata

Field	Value
Publication number	US-10047638-B2
Application number	US-201615088454-A
Country	US
Kind code	B2
Filing date	Apr 1, 2016
Priority date	Apr 9, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

Disclosed is a heat energy recovery system including: a heat energy recovery circuit that causes a working medium to circulate by means of a circulation pump to exchange heat with supercharged air from a supercharger via a first heater and exchange heat with steam from an exhaust-gas economizer via a second heater, in order to integrally drive a turbine and a generator; and a controller that performs stop control to stop the circulation pump based on the flow state of the steam in a first steam flow path that causes the steam to flow from the exhaust-gas economizer to a soot blower.

First claim

The invention claimed is:

1. A heat energy recovery system that is installed in a ship and recovers heat energy of supercharged air from a supercharger of an internal combustion engine via a working medium while recovering heat energy of steam from an economizer via the working medium under a condition in which the steam is supplied to a soot blower, that demands the steam in the ship, the heat energy recovery system comprising:
a heat energy recovery circuit having a closed-type medium circulation path in which
a first heater that heats the working medium by heat exchange between the supercharged air and the working medium,
a second heater that is connected in series to the first heater and heats the working medium by heat exchange between the steam from the economizer and the working medium, an expander that generates power based on expansion of the working medium heated by the first heater and the second heater,
a condenser that condenses the working medium flowing out from the expander, and a pump that conveys the working medium from the condenser are connected in sequence;

a power recovery machine that is connected to the expander and recovers the power of the expander;
a first steam flow path that causes the steam to flow from the economizer to the soot blower that demands the steam;
a second steam flow path that branches off from the first steam flow path and causes the steam to flow from the economizer to the second heater; and
a controller that performs stop control to stop an operation of the pump based on at least one of a flow state of the steam in the first steam flow path and a flow state of the steam in the second steam flow path,
wherein said flow state of the steam includes at least one of a temperature, a pressure, and flow rate of the steam in the first stream flow path or in the second steam flow path, detected by at least one detection unit.

2. The heat energy recovery system according to claim 1 , further comprising:
an on-off valve provided on a downstream side with respect to a point at which the second steam flow path branches off from the first steam flow path; and
the at least one detection unit including a temperature detection unit that detects a temperature of the steam on a downstream side with respect to the on-off valve in the first steam flow path,
wherein the controller performs the stop control when the temperature detected by the temperature detection unit is greater than or equal to a predetermined temperature at which the steam is determined to be supplied to the soot blower that demands the steam.

3. The heat energy recovery system according to claim 2 , wherein the controller performs resumption control to resume the operation of the pump when the detected temperature decreases to a temperature less than the predetermined temperature in a state in which the operation of the pump has been stopped according to the stop control.

4. The heat energy recovery system according to claim 1 , further comprising:
an on-off valve provided on a downstream side with respect to a point at which the second steam flow path branches off from the first steam flow path; and
the at least one detection unit including a valve detection unit that detects an opened state and a closed state of the on-off valve,
wherein the controller performs the stop control when the opened state of the on-off valve is detected by the valve detection unit.

5. The heat energy recovery system according to claim 4 , wherein the controller performs resumption control to resume the operation of the pump when the closed state of the on-off valve is detected in a state in which the operation of the pump has been stopped according to the stop control.

6. The heat energy recovery system according to claim 1 ,
wherein the at least one detection unit includes a pressure detection unit detecting a pressure of the steam flowing into the second steam flow path; and
wherein the controller performs the stop control when the pressure detected by the pressure detection unit is less than predetermined pressure at which the steam is determined to be supplied to the soot blower that demands the steam.

7. The heat energy recovery system according to claim 6 ,
wherein the controller performs resumption control to resume the operation of the pump when the detected pressure increases to pressure greater than or equal to the predetermined pressure in a state in which the pump has been stopped according to the stop control.

8. The heat energy recovery system according to claim 1 , further comprising:
an on-off valve provided on a downstream side with respect to a point at which the second steam flow path branches off from the first steam flow path;
wherein the at least one detection unit includes a pressure detection unit detecting a pressure of the steam on a downstream side with respect to the on-off valve in the first steam flow path; and
wherein the controller performs the stop control when the pressure detected by the pressure detection unit is greater than or equal to predetermined pressure at which the steam is determined to be supplied to the soot blower that demands the steam.

9. The heat energy recovery system according to claim 8 , wherein the controller performs resumption control to resume the operation of the pump when the detected pressure decreases to pressure less than the predetermined pressure in a state in which the operation of the pump has been stopped according to the stop control.

10. The heat energy recovery system according to claim 1 ,
wherein the at least one detection unit includes a temperature detection unit detecting a temperature of the steam flowing into the second steam flow path; and
wherein the controller performs the stop control when the temperature detected by the temperature detection unit is less than a predetermined temperature at which the steam is determined to be supplied to the soot blower that demands the steam.

11. The heat energy recovery system according to claim 10 , wherein the controller performs resumption control to resume the operation of the pump when the detected temperature increases to a temperature greater than or equal to the predetermined temperature in a state in which the pump has been stopped according to the stop control.

12. The heat energy recovery system according to claim 1 , further comprising:
an on-off valve provided on a downstream side with respect to a point at which the second steam flow path branches off from the first steam flow path;
wherein the at least one detection unit includes a flow-rate detection unit detecting a flow rate of the steam on a downstream side with respect to the on-off valve in the first steam flow path; and
wherein the controller performs the stop control when the flow rate detected by the flow-rate detection unit is greater than or equal to a predetermined flow rate at which the steam is determined to be supplied to the soot blower that demands the steam.

13. The heat energy recovery system according to claim 12 , wherein the controller performs resumption control to resume the operation of the pump when the detected flow rate decreases to a flow rate less than the predetermined flow rate in a state in which the operation of the pump has been stopped according to the stop control.

14. The heat energy recovery system according to claim 1 ,
wherein the at least one detection unit includes a flow-rate detection unit detecting a flow rate of the steam flowing into the second steam flow path; and
wherein the controller performs the stop control when the flow rate detected by the flow-rate detection unit is less than a predetermi

Assignees

• Kobe Steel Ltd
• Asahi Shipping Co Ltd
• Tsuneishi Shipbuilding Co Ltd
• Miura Kogyo Kk

Inventors

• Adachi Shigeto
• Narukawa Yutaka
• Fujii Tetsuro
• Arahira Kazuya
• Yamamoto Masakazu
• Kobayashi Yutaka
• Sageshima Toshio

Classifications

• F01K15/045

  Control thereof (F01K3/22, F01K7/00, F01K13/02 take precedence) · CPC title

• F01K13/02 Primary

  Controlling, e.g. stopping or starting · CPC title

• F02G5/04

  in combination with other waste heat from combustion engines · CPC title

• F01K23/10

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title

• B63B35/44

  Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices {(construction methods for floating offshore platforms B63B75/00)} · CPC title