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Method of continuously cooling and purifying gas, for use in food industry, involves transferring material and heat in counter-flow with cooling and washing water in transfer units
Method of continuously cooling and purifying gas, for use in food industry, involves transferring material and heat in counter-flow with cooling and washing water in transfer units
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机译：用于食品工业的连续冷却和净化气体的方法，涉及在输送装置中与冷却和洗涤水逆流输送物料和热量
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摘要
Material and heat are transferred in counter-flow between the gas to be cooled and purified (G0) and a flow of washing and cooling water (L1). The water is purified and cleaned for re-use by transfer of heat and material between the used water (L2) and an air flow (A0), before being recycled to treat the gas. The water is of sufficient quality to allow the gas to be used in the food industry : In stage (a) material and heat are transferred in counter-flow in a number of transfer units (NUTa) between a flow of gas to be cooled and purified (G0) circulating at a flow rate (D0) with a temperature (T0) and an adiabatic saturation temperature (T5) and a flow of washing and cooling water (L1) circulating at a flow rate (D1) with a temperature (T1) = T5. This produces an outlet flow of water (L2) circulating at a flow rate (D2) containing impurities from the initial gas flow (G0) with a temperature (T2) that is T1-T5, and a cooled and purified gas flow (G1) circulating at a flow rate (D3) and a temperature equal to T3 T5 and = T1. In stage (b), material and heat are transferred in counter-flow in a number of transfer units NUTb between the outlet flow of water (L2) from stage (a) and an air flow (A0) circulating at a flow rate (D4) and temperature (T4) and an adiabatic saturation temperature (T6) T2. This produces a flow of purified and cooled water (L'1) circulating at a flow rate (D'1) at a temperature (T'1) forming the greater part of the flow of washing and cooling water (L1) used in stage (a). Washing and cooling water designates a water of sufficient quality not to contaminate the gas to be purified and make it improper for use in the food industry. The difference (T5-T1) is = 10 [deg]C, preferably = 40 [deg]C. The mass ratio D0/D1 is 0.02-1. Before stage (a) there is a stage (a0) of cooling the gas from a temperature T'0 to T0. During stage (a) a flow (L1) of water is introduced circulating at a flow rate D1 = D1 - D'1 and the flow L'1) is purged with a flow (L2) circulating at a flow D2. Stage (b) is followed by a stage (b1) of cooling the water flow (L'1) or (L'1 - L2) to bring it to the temperature T1. A further stage (c) can involve liquefaction and/or compression of the gas flow (G1) from stage (a). The gas to be purified and cooled is carbon dioxide. An independent claim is made for an installation to carry out the above process. This contains a gas/water tower (A) and an atmospheric tower (A') connected by various pipes, and can include additional means of cooling and exposure to ultraviolet light.
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