Boilers and HRSGs |


Grate ideas for improved flame monitoring from Valmet


Above: Example of flame measurements produced by Valmet Grate Combustion Vision


Right: Valmet Grate Combustion Vision user interface


A new software application for the Valmet Visible Thermal Imaging System is designed to help operators improve the performance of moving grate boilers at waste-to-energy plants. The new app, called Valmet Grate Combustion Vision, detects the flame and measures the flame front location on the grate. This improves flame monitoring and helps to optimise combustion, says Valmet, resulting in maximised grate capacity and less down time. Available measurements include: average flame width, height, size in up to 49 combustion zones with custom alarms; average flame temperature; up to four segmented flame fronts; and flame front location and related statistics.


Above: Waste-to-energy boiler with grate camera installed, part of the Valmet Visible Thermal Imaging System


“We wanted to develop a tool to increase the load and waste throughput without the risk of overloading the grate. Valmet Grate


Japan looks to ammonia co-firing


JERA (Tepco/Chubu Electric 50:50 joint venture) has received notice of acceptance for grant applications to the Japanese New Energy and Industrial Technology Development Organization (“NEDO”) for projects aimed at developing and demonstrating technology for increased ammonia co-firing rate at coal-fired boilers. The applications, under the Green Innovation Fund programme, have been submitted jointly with boilermakers MHI and IHI.


Both projects run from FY 2021 to FY 2028. The JERA/MHI project aims to develop an ammonia single-fuel burner suitable for coal- fired boilers and to demonstrate operation of the burner at actual boilers. Based on the results, the two companies will decide whether to install the burners at JERA’s MHI-supplied coal-fired boilers and plan to verify co-firing with at least 50% ammonia at two units with different boiler types by FY 2028. JERA and IHI are already working under


a NEDO grant programme on a project to demonstrate 20% ammonia at JERA’s Hekinan unit 4 coal plant.


The new project aims to develop a burner capable of 50% ammonia co-firing and to install it at Hekinan unit 4 or 5.


As with the MHI joint project the hope is to be co-firing with at least 50% ammonia at an actual power plant by FY 2028.


In February 2021, JERA said it had launched an international competitive bid process for the procurement of fuel ammonia and had sent a request for proposals to over 30 companies.


Among bid conditions: long-term contract, from FY2027 to the 2040s; up to 500 000 t/y; carbon dioxide not to be generated during ammonia production, or, if it is, must be captured and sequestered; JERA able to participate in production projects. JERA plans to select companies for further discussions of specifics by May 2022.


34 | April 2022| www.modernpowersystems.com


Combustion Vision recognises the flame front and indicates where the combustion is happening. The flame front location can be controlled by individually adjusting the speed of each grate. This is essential when maximising load in waste-to-energy grate boilers where fuel quality varies and can’t be predicted,” says Timo Ojanen, technical product manager, Valmet. The Valmet Visible Thermal Imaging System is a rugged, air-cooled, HD camera paired with a high-resolution thermal sensor for real-time temperature measurements. It is engineered for durability and longevity inside hot and dusty environments, providing a tool for comprehensive observation and analysis of furnace environments.


The new application has been developed with Tammervoima and piloted in their waste- to-energy plant in Finland.


Electrode boiler for Ejstrupholm


A 7 MW 10 kV PARAT Halvorsen electrode boiler has been installed for Danish district heating company Ejstrupholm Varmeværk.


The IEH high voltage electrode boiler will be used for district heating and primary grid regulation. The boiler has a design temperature of 110°C and design pressure of 6 barg. AS:SCAN and


Tjæreborg Industri, with Tjæreborg Industri as main contractor, were responsible for installation (right).


Ejstrupholm Varmeværk, founded 1962, initially used oil for heating, subsequently converting to gas. Recent years have seen deployment of solar panels, heat pumps and now the electrode boiler.


(Photo AS:Scan)


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