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Chemical Recovery Boilers in Pulp and Paper Plants - Part
against corrosion, without further chemical additions. AVT can be used in "conventional" and HRSG drum-type boilers, provided high purity feedwater is available and the build-up of impurities in the boiler/evaporator water can be strictly controlled. However, ammonia is a poor alkalizing agent …
The combustion of black liquor in a recovery boiler results among others in a chemical process in which sodium sulfide (Na 2 S) is recovered through the chemical reaction of the combustion process. In the pulp and paper industry, the recovery of sodium sulfide is essential to the paper manufacturer, inasmuch as the chemical is used in the
THE BABCOCK & WILCOX CO. BOILER DIVISION ^^^ yENT INTCJl^O'. meuM, A schematic diagram of the steam generator system is shown on Figure A. This diagram shows one sodium loop, including IHX, boiler, superheater, and reheater. Heat loads, flows, pressures, and tenperatures are tabiilated
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 convenient
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). 5
three sub-networks, a chemical pulping section, a biochemical production section and a black liquor utilization section.  provides a review of di erent gasi cation technologies as alterna-tives to replace the recovery boiler. According to , catalytic hydrothermal gasi cation has never been tested with black liquor as a resource.
injection of a neutralizing agent such as aluminum sulfate is required in order to reduce the pH to an acceptable level. The the white liquor chemicals fed at the di-gester. These chemicals are concentrated in the recovery boiler, and a high concen- recovery boiler. There is a fine balance between effective washing and conserva-
air to the boiler, typically at 3 different levels An ID fan to withdraw the flue gas from the boiler Operate on a balanced draft FD Fan ID Fan Recover Inorganic Chemicals Recover the inorganic chemicals as a molten smelt of Na 2S and Na 2CO 3 Na 2S requires a local reducing (oxygen deficient) environment Some S leaves as Na 2SO 4 – incomplete
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 1-10
Jun 08, 2021 · When the capacity of the recovery boiler is reached, there are two options to increase the production of pulp:  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). 
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.
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: …
Methods and apparatus for maintaining sulfur concentration in the chemical recovery cycle of a Kraft pulping process. A portion of the recovery boiler ash is dissolved, treated to remove solids, and combined with an acid to provide a solution. The recovery boiler ash may be dissolved directly in the acid. The acid may be effluent from a chlorine dioxide generator.
Having good knowledge about Process of Pulp Mill and Power Plant such as Water treatment, CFB Boiler, Chemical Recovery Boiler, Steam Turbine, Gas Turbine, Evaporator, Recausticizing, Lime Kiln, and Effluent Treatment Advance in Field Instrumentation.
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 of
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 …
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 combined
b. Treatment boiler feed water and boiler water at Riau Prima Energi (Service Area : PT RAPP) There are 4 recovery boiler (RB-1, RB-2, RB-3, and RB-5) and 3 power boiler (PB-1, PB-2, and PB-3) that we have to treat. The design pressure of recovery boiler is one of the highest in …