Exhaust gas cooler

Patent metadata

Field	Value
Publication number	US-11333348-B2
Application number	US-201916976415-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Mar 1, 2018
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

An exhaust gas cooler includes: a steam drum containing first water; an economizer for heat exchange between exhaust gas and the first water supplied from the steam drum; and a feedwater pipe for supplying the first water with second water having a lower temperature than the first water. The exhaust gas cooler is configured such that the first water flowing out of the economizer is introduced into the steam drum. The second water is divided and supplied to the first water flowing out of the economizer and the first water flowing into the economizer.

First claim

The invention claimed is:

1. An exhaust gas cooler comprising:
a steam drum containing first water;
an exhaust heat boiler for heating the first water in the steam drum to produce steam by heat exchange between the first water and exhaust gas;
an economizer for heat exchange between the exhaust gas, after the heat exchange between the first water and the exhaust gas, and the heated first water supplied from the steam drum;
a feedwater pipe for supplying the first water with second water having a lower temperature than the first water;
a temperature detection member that detects an inlet temperature, which is a temperature of the first water flowing into the economizer; and
an inlet-supply-amount control member that controls an inlet supply amount, which is a supply amount of the second water supplied to the first water flowing into the economizer,
wherein the exhaust gas cooler is configured such that the first water flowing out of the economizer is introduced into the steam drum,
wherein the second water is divided and supplied to the first water flowing out of the economizer and the first water flowing into the economizer, and
wherein the inlet-supply-amount control member controls the inlet supply amount such that the inlet temperature is in a predetermined setting temperature range.

2. The exhaust gas cooler according to claim 1 ,
wherein part of the second water is supplied to the first water flowing out of the economizer between the economizer and the steam drum.

3. The exhaust gas cooler according to claim 1 ,
wherein the exhaust gas is exhaust gas from a combustion furnace in an integrated coal gasification combined cycle power plant.

Assignees

• Mitsubishi Heavy Ind Eng Ltd

Inventors

• Yoshida Kaori
• Murakami Moritoshi
• Yamazaki Ayumu
• Kan Rikio
• Kunimune Kiyotaka
• Nakayama Koji

Classifications

• F22D5/34

  Applications of valves · CPC title

• F22B1/1846 Primary

  the hot gas being loaded with particles, e.g. waste heat boilers after a coal gasification plant · CPC title

• Y02E20/18

  Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS] · CPC title

• Y02E20/30

  Technologies for a more efficient combustion or heat usage · CPC title

• F22B1/1807 Primary

  using the exhaust gases of combustion engines · CPC title