Gasification apparatus, control device, integrated gasification combined cycle, and control method

Patent metadata

Field	Value
Publication number	US-10808191-B2
Application number	US-201615777000-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Nov 18, 2015
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A gasification apparatus for gasifying a carbonaceous feedstock to produce raw syngas includes a gasifier in which the raw syngas flows, a heat exchanger provided inside the gasifier downstream to exchange heat with the raw syngas, a hanger pipe through which a part of water supplied from a water supply passage flows to support a load of the heat exchanger, a heat exchanger inflow passage configured to cause the water flowing out from the hanger pipe to flow to an inflow side of the heat exchanger, a bypass passage branching from the water supply passage to cause a remaining of the water supplied to the hanger pipe, a bypass valve provided in the bypass passage, and a control device configured to control, depending on a gasifier load, an opening degree of the bypass valve to adjust the water supplied to the hanger pipe and the bypass passage.

First claim

The invention claimed is:

1. A gasification apparatus for gasifying a carbonaceous feedstock to produce raw syngas, the gasification apparatus comprising:
a gasifier in which the raw syngas flows;
a heat exchanger provided inside the gasifier on a downstream side where the raw syngas flows to exchange heat with the raw syngas;
a hanger pipe through which at least a part of water supplied from a water supply passage flows, the hanger pipe being configured to support a load of the heat exchanger;
a heat exchanger inflow passage configured to cause the water flowing out from the hanger pipe to flow to an inflow side of the heat exchanger, the water flowing out from the hanger pipe being the at least a part of the water supplied from the water supply passage;
a bypass passage branching from the water supply passage to cause a remaining of the water not supplied to the hanger pipe to bypass the hanger pipe and flow through the heat exchanger inflow passage;
a bypass valve provided in the bypass passage, an opening degree of the bypass valve being adjusted such that an amount of the remaining water flowing through the bypass passage is adjusted; and
a control device configured to control, depending on a gasifier load that is a load in the gasifier, the opening degree of the bypass valve to adjust an amount of the at least part of the water and the remaining water supplied to the hanger pipe and the bypass passage.

2. The gasification apparatus according to claim 1 , wherein
the control device is configured to close the bypass valve from when the carbonaceous feedstock is input into the gasifier at activation until when the gasifier load reaches a set load, and
the set load is a load with which a flow velocity in the hanger pipe is equal to or lower than an upper limit flow velocity regulated by design.

3. The gasification apparatus according to claim 1 , wherein
the control device is configured to open the bypass valve with a minimum opening degree from when the carbonaceous feedstock is input into the gasifier at activation until when the gasifier load reaches a set load, and
the set load is a load with which a flow velocity in the hanger pipe is equal to or lower than an upper limit flow velocity regulated by design.

4. An integrated gasification combined cycle, comprising:
the gasification apparatus for gasifying a carbonaceous feedstock to produce raw syngas according to claim 1 ;
a gas turbine configured to be rotationally driven by combusting at least a part of the raw syngas produced by the gasification apparatus;
a steam turbine configured to be rotationally driven by steam produced by a heat recovery steam generator into which turbine flue gas discharged from the gas turbine is introduced; and
a generator coupled to the gas turbine and the steam turbine.

5. The gasification apparatus according to claim 1 , wherein
the control device executes valve opening operation control for operating the bypass valve to an open side when the gasifier load is equal to or larger than a set load, and
the set load is a load with which a flow velocity in the hanger pipe is equal to or lower than an upper limit flow velocity regulated by design.

6. The gasification apparatus according to claim 5 , wherein the control device sets the opening degree of the bypass valve to a predetermined constant opening degree when the valve opening operation control for the bypass valve is executed.

7. The gasification apparatus according to claim 5 , further comprising:
an outlet header provided between the hanger pipe and the heat exchanger inflow passage; and
a first temperature detector configured to detect a temperature of water in the outlet header, wherein
the control device is configured to adjust, when the valve opening operation control for the bypass valve is executed, the opening degree of the bypass valve such that a first detected temperature detected by the first temperature detector becomes equal to or lower than a target monitoring temperature lower than a saturated vapor temperature at a pressure of the water in the outlet header.

8. The gasification apparatus according to claim 6 , further comprising:
an outlet header provided between the hanger pipe and the heat exchanger inflow passage; and
a first temperature detector configured to detect a temperature of water in the outlet header, wherein
the control device is configured to execute, when a first detected temperature detected by the first temperature detector is equal to or higher than a target monitoring temperature lower than a saturated vapor temperature at a pressure of the water in the outlet header, valve closing operation control for operating the bypass valve to a closed side.

9. The gasification apparatus according to claim 6 , further comprising a second temperature detector configured to detect a temperature of water flowing out from an effluent port of the heat exchanger, wherein
the control device is configured to execute, when a second detected temperature detected by the second temperature detector reaches a target monitoring temperature lower than a saturated vapor temperature at a pressure of the water flowing out from the effluent port, the valve opening operation control for operating the bypass valve to the open side.

10. A control device for a gasification apparatus for gasifying a carbonaceous feedstock to produce raw syngas,
the gasification apparatus comprising:
a gasifier in which the raw syngas flows;
a heat exchanger provided inside the gasifier on a downstream side where the raw syngas flows to exchange heat with the raw syngas;
a hanger pipe through which at least a part of water supplied from a water supply passage flows, the hanger pipe being configured to support a load of the heat exchanger;
a heat exchanger inflow passage configured to cause the water flowing out from the hanger pipe to flow to an inflow side of the heat exchanger, the water flowing out from the hanger pipe being the at least a part of the water supplied from the water supply passage;
a bypass passage branching from the water supply passage to cause a remaining of the water not supplied to the hanger pipe to bypass the hanger pipe and flow through the heat exchanger inflow passage; and
a bypass valve provided in the bypass passage, an opening degree of the bypass valve being adjusted such that an amount of the remaining water flowing through the bypass passage is adjusted, wherein
the control device is configured to control, depending on a gasifier load that is a load in the gasifier, the opening degree of the bypass valve to adjust an amount of the at least part of the water and the remaining water supplied to the hanger pipe and the bypass passage.

11. A control method for a gasification apparatus for gasifying a carbonaceous feedstock to produce raw syngas, the gasification apparatus including
a gasifier in which the raw syngas flows,
a heat exchanger provided inside the gasifier on a downstream side where the raw syngas flows to exchange heat with the raw syngas,
a hanger pipe through which at least a part of water supplied from a water supply passage flows, the hanger pipe being configured to support a load of the heat exchanger,
a heat exchanger inflow passage configured to cause the water flowing out from the hanger pipe to flow to an inflow side of the heat exchanger, the water flowing out from the hanger pipe being the at least a part of the water supplied from the water supply passage,
a bypass passage branching from the water supply passage to cause a remaining of the water not supplied to the hanger pipe to bypass the hanger pipe and flow through the heat exchanger inflow passage, and
a bypass val

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Haari Kenta
• Shibata Yasunari
• Takei Yasuhiro
• Kitada Masashi
• Chuman Fumihiro
• Takeda Shigetaka

Classifications

• F01K23/10

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

• F22B1/1815

  using the exhaust gases of gas-turbines · CPC title

• Y02E20/18

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

• C10J2300/093

  Coal · CPC title

• F02C3/28

  using a separate gas producer for gasifying the fuel before combustion · CPC title