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Boiler, acid heat recovery

Fig. 24.7. Schematic of acid heat to steam energy recovery system, after Puricelli et al., 1998. It is for intermediate H2S04 making, Fig. 9.6. Note (i) the double packed bed H2S04 making tower and (ii) boiler. Industrial acid heat recovery H2S04 making towers are 25m high and 10 m diameter. They produce 2000 to 4000 tonnes of H2S04 per day. For photographs see Sulfur, 2004.--------- large flows. small flows. Fig. 24.7. Schematic of acid heat to steam energy recovery system, after Puricelli et al., 1998. It is for intermediate H2S04 making, Fig. 9.6. Note (i) the double packed bed H2S04 making tower and (ii) boiler. Industrial acid heat recovery H2S04 making towers are 25m high and 10 m diameter. They produce 2000 to 4000 tonnes of H2S04 per day. For photographs see Sulfur, 2004.--------- large flows. small flows.
Chemical in South Korea in 1987.38 39 The process is based on 310 stainless steel, which resists corrosion in 98.5 percent H2S04 at temperatures up to 220°C. The intermediate absorber at Namhae takes 194°C gas from the converter third stage economizer and absorbs the S03 in 199°C, 99 percent acid. Recirculated acid from the absorber is cooled from 220°C in a 10-bar HRS boiler. The added energy recovery for this process is reported to increase the total recovery to 90 percent. Monsanto s proposed Monarch process combines HRS technology with the wet catalytic converter process (Lurgi) to increase heat recovery and shift it to high-pressure steam production for electric power generation.36... [Pg.1179]

Figure 8-17 shows the flow through a heat-resistant alloy-metal converter joined to a waste-heat boiler, and the recovery system. The absorber is loaded with a water solution of polyalcohol-boric acid complex made from 8.3 parts pentaerythritol and 2.5 parts boric acid. In the cold, this solution dissolves HCN and ties up NH3 as the ammonium salt of the complex, thereby preventing polymerization of HCN in the presence of free NHj. The HCN is removed first in the stripper under moderately reduced pressure (10 in. Hg) at about 88°C, after which the NHj is stripped out by breaking up the ammonium salt at about 132°C under 25 psig. [Pg.454]

The SOa-containing gas leaving the furnace is cooled in a WHRB (waste heat recovery boiler), cleaned, and then admitted to the converter of the sulfuric acid plant. [Pg.16]

Earlier designs of sulfuric acid plants preferred minimizing initial capital cost and hence heat recovery equipment was not common. For example, these designs had atmospheric cooling ducts, air cooled heat exchangers, or air injection facilities instead of waste heat recovery boilers and economisers. [Pg.31]

Cost of producing DM water for boiler feed (if the heat recovery system consists of high-pressure boilers) and acid dilation. [Pg.94]

Hot gas streams at 900-1000 °C are generated in sulphuric acid plants by bmning sulphur. These gases are cooled by waste heat recovery boiler before further processing. High-pressure steam at pressures of 45 kg/cm and temperatures of 410 °C is generated as a by-product which is supplied to a condensing turbine to produce power (which can be more than what is required to mn the plant). This surplus can be exported to other industries. [Pg.221]

SO2 containing process gas from the FSF is cooled and de-dusted by a heat recovery boiler and a electrostatic precipitator (ESP). After that the gas goes to a sulphuric acid plant. Flue dust is recirculated to FSF. [Pg.326]

Acid cooling method Heat recovery system boilers ... [Pg.108]

A derivative of the Claus process is the Recycle Selectox process, developed by Parsons and Unocal and Hcensed through UOP. Once-Thm Selectox is suitable for very lean acid gas streams (1—5 mol % hydrogen sulfide), which cannot be effectively processed in a Claus unit. As shown in Figure 9, the process is similar to a standard Claus plant, except that the thermal combustor and waste heat boiler have been replaced with a catalytic reactor. The Selectox catalyst promotes the selective oxidation of hydrogen sulfide to sulfur dioxide, ie, hydrocarbons in the feed are not oxidized. These plants typically employ two Claus catalytic stages downstream of the Selectox reactor, to achieve an overall sulfur recovery of 90—95%. [Pg.215]


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