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  • Control System Improves Reliability and Safety of Recovery

    4-4 Recovery Boiler Chemical PrinciplesLearn More


    fiber line and chemical recovery line. The pulp is produced in the fiber line, and the pulping chemicals are recovered and the organic residual of wood is utilized in energy production in the recovery line. Due to energy production in the recovery boiler, kraft pulp mills have an energy surplus. (Virkola, 1983) Figure 1 …Learn More

  • High solids black liquor of reduced viscosity and

    The recovery of the pulping chemicals is obtained by incinerating the black liquor in a chemical recovery boiler. The chemical recovery boiler is perhaps the single most important unit in a kraft process. In the boiler, the organic matter in the black liquor is combusted hence generating process heat …Learn More


    chemical composition of the furnace recovery boiler, - especially the reduction efficiency when different operational conditions are used. This result confirms the potential of this approach in Learn More


    all-volatile treatment [1]. The most common treatment regimen for recovery boilers is congruent phosphate control, with the objective of avoiding corrosive attack from either free caustic or acid phosphate in the boiler water. The importance of avoiding corrosive conditions and the requirements for recovery boiler programs operating underLearn More

  • Scale deposits in kraft pulp bleach plants with reduced

    Aug 01, 2014 · The cooked chips are then washed, and the filtrate (=weak black liquor) is then concentrated with evaporators. The strong black liquor is burnt in the recovery boiler, to reclaim heat and chemicals. The green liquor (Na 2 S and Na 2 CO 3) thus produced is regenerated to white liquor by a re-caustification process. The resulting pulp (brownstock Learn More

  • 4-4 Recovery Boiler Chemical Principles

    Organic sulphur (balance) 35 Total 100 In an ideal recovery boiler process, all the diverse sulphur and sodium compounds would be transformed to sodium sulphide (Na2S) and sodium carbonate (Na2CO3) and be contained in the smelt on the furnace bottom. In a real recovery boiler, however, the process is more complicated. Figure shows an example ofLearn More

  • Debottlenecking a Pulp Mill by Producing Biofuels from

    Apr 14, 2021 · When the capacity of the recovery boiler is reached, there are two options to increase the production of pulp: 4 1) upgrading of the recovery boiler; 2) reduce the amount of black liquor that is burnt in the recovery boiler; the latter can be easily achieved by extracting the Kraft lignin (Figure 1). 5Learn More

  • 7.0 Chemical Treatment - Steam Turbine, Steam Boiler

    boiler water treatment and condensate treatment is required. Boilers are often classified by operating (throttle) pressure. These groupings are arbitrary, and there is much overlapping between groups, but for purposes of discussing chemical treatment the following groupings are convenientLearn More

  • A Study in the oxidation of Kraft black liquor

    Chemical losses from the recovery boiler can be reduced by installation of cyclones and electrostatic precipitators or wet-type scrubbers. In some instances all three devices are used. Evaporator chemical losses can be reduced by black liquor oxidation or gas scrubbers, while digester losses may be reduced by by-product recovery, solution of Learn More

  • Mitsubishi Power, Ltd. | Chemical Recovery Boilers

    kraft recovery boilers Fly ash particle formation inLearn More

  • 4-4 Recovery Boiler Chemical Principles

    SODIUM BALANCE IN A KRAFT RECOVERY BOILER (g Na/kg BL solids) Na2SO4 (50 mg/m 3) Na2CO3 Na2S Na2SO4 MAKE UP SMELT BL EMISSIONS 0.04 0.04 18 7 Na+ 200 207 225 137 63.3 6.7 Na2SO4 Na2CO3 Na2SO4 SULPHATE REDUCTION IN SMELT •Either: …Learn More

  • Energy Recovery and Emissions of PBDD/Fs and PBDEs from Co

    The emissions of polybrominated dibenzo-p-dioxins, dibenzofurans (PBDD/Fs), and polybrominated diphenyl ethers (PBDEs) from trial combustion of 10 wt % dried industrial-wastewater-treatment sludge (IWTS) and 90 wt % woodchip in an industrial boiler were investigated and compared to that from woodchip combustion. The PBDD/F toxic equivalent (TEQ) and PBDE emissions increased from 0.121 …Learn More

  • Water Handbook - Ion Exchange & Water Demineralization | SUEZ

    In the resin, the hardness ions are exchanged with the sodium, and the sodium diffuses into the bulk water solution. The hardness-free water, termed soft water, can then be used for low to medium pressure boiler feedwater, reverse osmosis system makeup, some chemical processes, and commercial applications, such as laundries.Learn More

  • A-Recovery+ chemical recovery concept for kraft mills

    Chemical Process Recovery (PR) Boilers B&W's single-drum recovery boiler, now the standard in the pulp and paper industry, provides high availability with safe operation and low maintenance. We have been at the forefront of technologies which improve boiler and cycle efficiency, such as firing higher solids concentration liquors, using low pressure steam to heat combustion air, and feedwater heating.Learn More


    promising alternative to the conventional recovery boiler process used in chemical pulping. Compared to the conventional recovery process, i.e. combustion of black liquor in a recovery boiler, the primary advantage of gasification is the potential to produce bio-fuels and chemicals. Black liquor with an integrated combinedLearn More

  • Vakkilainen Esa K. - LUT

    Mar 25, 2005 · 1.1 Function of recovery boiler 1-1 1.2 Early recovery technology 1-2 1.3 First recovery boilers 1-4 1.4 Development of recovery boiler technology 1-5 1.5 High dry solids 1-7 1.6 Improving air systems 1-7 1.7 High temperature and pressure recovery boiler 1-9 1.8 Gasification 1-10Learn More

  • Heuristic Algorithm for Production Control of an

    Jan 01, 1980 · The reco­ very boiler must be considered mainly as a L.S.S.-T* K. Leiviska et al. part of the chemical recovery cycle, and a proper chemical balance must be provided. Because most of the energy used in the pulp mill is produced by the recovery boiler also the energy balance must be kept in mind.Learn More

  • Chemical Recovery Boilers in Pulp and Paper Plants - Part

    Chemical Recovery Boilers in Pulp and Paper Plants - Part Learn More

  • Vakkilainen Esa K. - LUT

    Apr 24, 2009 · Functions of Chemical Recovery Boilers. 1 To recover the inorganic chemicals from black liquor. 2 To produce high pressure and high temperature steam for captive power generation and also provide steam for use in Pulp and Paper mill operations. Pulp mill operations totally depend upon the chemical recovery boiler.Learn More