Waste-to-energy plant

Patent metadata

Field	Value
Publication number	US-2020200047-A1
Application number	US-201716092196-A
Country	US
Kind code	A1
Filing date	Jun 23, 2017
Priority date	Jun 23, 2016
Publication date	Jun 25, 2020
Grant date	—

Abstract

A Waste-to-Energy plant comprising: an incineration chamber in which waste is combusted generating flue gas; an economizer heating feedwater using heat from the flue gas; an evaporator producing steam from the heated feedwater using heat from the flue gas; a steam drum receiving heated feedwater from the economizer and supplying heated feedwater, the steam drum receiving steam from the evaporator and supplying steam; and a superheater receiving and heating steam from the steam drum to a superheated steam using heat from the flue gas; the incineration chamber comprising a first PCM-wall and a second PCM-wall each comprising a plurality of pipes and a layer of PCM provided between the pipes and the incineration chamber, the pipes in the first PCM-wall receiving heated feedwater from the steam drum and producing additional steam therein and the pipes of the second PCM-wall additionally heating steam therein using radiant heat from the incineration chamber.

First claim

1 . A Waste-to-Energy plant comprising:
an incineration chamber in which waste is combusted generating hot flue gas; at least one economizer to heat feedwater using heat from the hot flue gas; at least one evaporator to produce steam from the heated feedwater using heat from the hot flue gas; at least one steam drum to receive the heated feedwater from the at least one economizer and serve as a supply for the heated feedwater, the at least one steam drum further to receive the steam from the at least one evaporator and serve as a supply for the steam; and at least one superheater to receive the steam from the at least one steam drum and to further heat the steam to a superheated steam using heat from the hot flue gas; wherein the incineration chamber comprises a first PCM-wall and a second PCM-wall each comprising a plurality of pipes and a layer of PCM provided between the pipes and the incineration chamber, the plurality of pipes in the first PCM-wall receiving the heated feedwater from the steam drum and producing additional steam in the plurality of pipes in the first PCM-wall using radiant heat from the incineration chamber, and the second PCM-wall additionally heating steam in the plurality of pipes of the second PCM-wall using radiant heat from the incineration chamber.

2 . The plant of claim 1 , wherein the PCM comprises one of: aluminium and an inorganic eutectic aluminium alloy.

3 . The plant of claim 1 , wherein the steam in the plurality of pipes of the second PCM-wall is superheated steam from the at least one superheater.

4 . The plant of claim 1 , wherein the superheater is a low-pressure superheater, the steam in the plurality of pipes of the second PCM-wall is the steam supplied from the steam drum, superheated steam from the second PCM-wall is passed through a high pressure turbine, the superheater receives and reheats steam from the high pressure turbine, and reheated steam from the superheater is passed through a low pressure turbine.

5 . The plant of claim 1 , further comprising a pump to control mass flow rate of steam between the first PCM-wall and the steam drum.

6 . The plant of any one of the preceding claim 1 , wherein for at least one of the first PCM-wall and the second PCM-wall, the layer of PCM is enveloped within a PCM-container, the PCM-container made of at least one of: carbon steel having an Al2O3 coating, carbon steel having a WC—Co coating, a ceramic inert to molten aluminium and molten aluminium alloys, and microencapsulation.

7 . The plant of claim 6 , wherein a surface of the PCM-container facing the plurality of pipes is shaped to conform to a shape of the plurality of pipes.

8 . The plant of claim 1 , wherein for at least one of the first PCM-wall and the second PCM-wall, an air gap is provided between the layer of PCM and the plurality of pipes.

Assignees

• Univ Nanyang Tech
• Univ Degli Studi Udine

Inventors

• Romagnoli Alessandro
• Dal Magro Fabio
• Nardin Gioacchino

Classifications

• C09K5/06

  the change of state being from liquid to solid or vice versa · CPC title

• F23G5/00 Primary

  Incineration of waste (of specific waste F23G7/00); Incinerator constructions; Details, accessories or control therefor · CPC title

• F01K3/247

  one heater being an incinerator · CPC title

• Y02E20/12

  Heat utilisation in combustion or incineration of waste · CPC title

• Y02E60/14

  Thermal energy storage · CPC title