How much power generation is lost in pulp mills due to inefficient cleaning of heat transfer surfaces?

Es posible optimizar significativamente el funcionamiento de los calderos de recuperación en los molinos de pulpa simplemente limpiando de manera más eficiente la suciedad que se acumula en las superficies de transferencia de calor. Lo sabemos, lo hemos investigado. Aquí está lo que descubrimos a partir de nuestro estudio sobre los calderos de recuperación en Suecia.

In Sweden, the average black liquor recovery boiler is rated at 1800 TDS/day. The typical steam consumption of the sootblowers is 5-10 % of the produced steam. In the average sized boiler, sootblower steam consumption is around 16 tons/hour, which can be used for 2-2.75 MW electricity, depending on steam data and type of turbine. With a yearly operation time of around 8,500 hours, this adds up to 545 GWh of electricity for 27 black liquor boilers. Roughly 45% of this can be saved by using a more efficient steam soot blowing system. Sistema de soplado de ceniza de alto impacto (HISS), is our patented method of optimizing steam sootblowers, i.e., saving 245 GWh of electricity. This corresponds to the yearly production of 40, 150m high wind turbine towers.

Now, let’s apply this globally. There are more than 450 recovery boilers around the world so, if we assume the same average boiler size and sootblower steam consumption as in Sweden, we end up with a potential total savings of around 4080 GWh of electricity per year. This corresponds to the yearly production of 660 wind turbine towers.

Today, one third of the black liquor boilers in Sweden are equipped with ¡Zzz!, and we are sure that more and more will follow— not just in Sweden, but around the world. Increasing the electrical output, as mentioned above, is one alternative for boosting mill revenue using sustainable, de-carbonizing power generation. But some plants use ¡Zzz! instead to step up the number of sootblower starts or combine increased starts with steam savings—and, thereby, increase boiler availability and mill production.

El HISS system offers unique flexibility when it comes to operating recovery boilers in the most sustainable and economical way.

Un estudio de caso y un informe sobre la instalación HISS en el caldero de recuperación de BillerudKorsnäs Gruvön. Todos los 80 hornos de combustión de humo fueron reconstruidos en 2016 con Heat Managementuna solución patentada que utiliza un actuador local para controlar las válvulas de émbolo del vapor en los hornos de combustión de humo, junto con un software mejorado para el monitoreo y control de los hornos de combustión de humo.