In industrial chemistry, black liquor is the by-product from the kraft process when digesting pulpwood into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers.

Depending on the quality of the steam, and the type/ of the turbine, a 1000 t/d kraft pulp mill can generate 25 to 35 MW of electricity by burning 1500 t/d black liquor dry solids in its recovery boiler. The lowered pressure steam exiting from the turbine is …

This specific configuration using black liquor is sometimes called a black liquor gasification combined cycle (BLGCC). If integrated into a pulping mill, BLGCC can be scaled to provide as much power or steam as possible from the black liquor input or the turbine can be co-fired with natural gas to produce extra electricity.

Understanding the composition and properties of black liquor is important for pulp mill operators and environmental regulators alike. By knowing the chemical makeup of black liquor, operators can optimize their pulping process to improve the efficiency and quality of pulp production.

Black liquor is an extremely complex viscous alkaline solution of water containing organic and inorganic components, where the composition varies across different paper mills due to different cooking conditions and wood used.

Chemical Recovery Process is used to meet the following objectives in an integrated paper mill: To treat and dispose waste liquor generated from pulp mill, thereby reducing the environmental pollution. To burn the organic matter and beneficially use the thermal energy for the generation of high pressure steam. The Fig.

Using black liquor gasification lets pulp mills produce their own power, which lowers their expenses for buying energy from other suppliers. The black liquor gasification process helps paper mills thrive while contributing to the creation of cleaner, carbon-free energy generation systems nationwide.

At kraft and soda pulp mills, spent cooking liquor (referred to as weak black liquor), from the brown stock washers is routed to the chemical recovery area. The chemical recovery process involves concentrating weak black liquor, combusting organic compounds, reducing inorganic compounds, and reconstituting the cooking liquor.

2010年11月1日 · Black liquor gasification (BLG) has potential to replace a Tomlinson recovery boiler as an alternative technology to increase safety, flexibility and energy efficiency of pulp and paper mills. This paper presents an extensive literature review of the research and development of various BLG technologies over recent years based on low and high ...

Black liquor gasification is an interesting option for production of synthesis gas that can subsequently be converted to a variety of motor fuels. The technology can be integrated into modern, ecocyclic, kraft pulp mill biorefineries. USA and Sweden lead developments in this field.