Exhaust gas cleaning apparatus

Claim 2

AN EXHAUST GAS CLEANING APPARATUS COMPRISING: A. AN INLET FOR DIRECTING AN EXHAUST GAS CONTAINING ACID MATERIAL FROM A SOURCE OF COMBUSTION; B. A REACTION TOWER CONNECTED SUBSTANTIALLY AT THE TOP END WITH SAID INLET AND AT THE OTHER END WITH AN EXHAUST GAS OUTLET; C. A SEPARATOR HAVING ONE END CONNECTED TO SAID EXHAUST GAS OUTLET AND THE OTHER END WITH AN OUTLET PORT; AND D. A TWO-FLUID SPRAYING DEVICE PROVIDED IN SAID REACTION TOWER FOR SPRAYING, IN THE FORM OF FINE LIQUID PARTICLES, A LIQUID CONTAINING ALKALI MATERIAL WHICH CAN REACT WITH SAID ACID MATERIAL, SAID SPRAYING DEVICE BEING PROVIDED WITH A PORT FOR INTRODUCING COMPRESSED GAS WHICH IS ADAPTED TO SPRAY THE LIQUID UNDER PRESSURE, SAID SPRAYING DEVICE FURTHER HAVING DIVERGING SPRAYING PASSAGES DISPOSED ON A

Claim 3

An apparatus in accordance with claim 1 in which the passages in said spraying device are shaped and sized so that the pArticle size of alkali solution sprayed therefrom is between 10 Mu and 50 Mu .

Claim 4

An apparatus in accordance with claim 1 in which said spraying device comprises an inner casing including a passage for the alkali solution, a liquid chamber connected to the passage, a plurality of liquid outlet ports extending radially outwardly from the liquid chamber and a plurality of spraying passages communicating with said outlet ports at the outer periphery of the liquid chamber and extending along a diverging conical surface; and an outer casing encircling said inner casing and comprising a compressed gas inlet pipe and a skirt adapted to be in close contact with the portion of the inner casing where said spraying passages are formed, said outer casing defining an air chamber with said inner casing when they are assembled.

Claim 5

An apparatus in accordance with claim 1, wherein said spraying passages are arranged at an angle of from about 45* to 60* with respect to the plane normal to the longitudinal centerline of said reaction tower.

Claim 6

An apparatus in accordance with claim 4, wherein the cross-sectional size of said spraying passages is so selected that the particle size of the alkali solution sprayed therefrom is between 10 Mu and 50 Mu .

Claim 7

An apparatus in accordance with claim 1, wherein said spraying means comprises an inner casing and an outer casing, said inner and outer casings defining therebetween said plurality of spraying passages.

Claim 8

An apparatus in accordance with claim 6, wherein said spraying means defines a liquid inlet passage for the alkali solution, a liquid chamber connected to said liquid inlet passage, a plurality of liquid outlet ports extending between said liquid chamber and respective spraying passages, an air chamber common to each of said spraying passages, and air inlet means in communication with said air chamber.

Claim 9

An apparatus in accordance with claim 7, wherein said air inlet means is arranged substantially tangentially to said air chamber.

Claim 10

An apparatus in accordance with claim 1, wherein each of said spraying passages is arranged on a generatrix of said conical surface.

Claim 11

An apparatus in accordance with claim 9, wherein said spraying passages are arranged at an angle of from about 45* to 60* with respect to the plane normal to the longitudinal centerline of said reaction tower.

Claim 12

An apparatus in accordance with claim 10, wherein the cross-sectional size of said spraying passages is so selected that the particle size of the alkali solution sprayed therefrom is between 10 Mu and 50 Mu .

Claim 13

An exhaust gas cleaning apparatus comprising: a reaction tower provided at one end with means for introducing an exhaust gas containing acid material from a source of combustion; a separator connected to another end of said reaction tower; and a spraying device having a plurality of passages for spraying into said reaction tower a liquid containing alkali material which can react with said acid material in the form of fine liquid particles, said passages of said spraying device being provided with an inlet for the liquid containing alkali material and with an inlet for an atomizing gas which aids the spraying of said liquid into said reaction tower and with an outlet for spraying said liquid and said atomizing gas directly into said reaction tower at an angle of 30* to 45* with respect to the axis of said reaction tower, said passages arranged so that fine liquid particles sprayed therefrom diverge in said reaction tower.

Claim 14

An exhaust gas cleaning apparatus comprising: a reaction tower provided at one end with means for introducing an exhaust gas containing acid material from a source of combustion; a separator connected to another end of said reaction tower; and a spraying device having a plurality of passages for spraying into said reaction tower a liquid containing alkali material which can react with said acid material in the form of fine liquid particles, said passages of said spraying device being provided with an inlet for the liquid containing alkali material and with an inlet for an atomizing gas which aids the spraying of said liquid into said reaction tower and with an outlet for spraying said liquid and said atomizing gas directly into said reaction tower at an angle of 30* to 45* with respect to the axis of said reaction tower, said passages arranged so that fine liquid particles sprayed therefrom diverge in said reaction tower.

Claim 15

An exhaust gas cleaning apparatus according to claim 12, wherein the passages in said spraying device are arranged such that said liquid particles are sprayed in the form of a cone diverging in the direction of the exhaust gas flow.

Claim 16

An exhaust gas cleaning apparatus according to claim 12, wherein said spraying device is disposed in said reaction tower near said means for Introducing exhaust gas.

Claim 17

An exhaust gas cleaning apparatus according to claim 12, in which the divergence of said liquid particles is in the direction of the exhaust gas flow at an angle of 30* to 45* with respect to the axis of said reaction tower.

Claim 18

An exhaust gas cleaning apparatus according to claim 15, wherein the passages in said spraying device are arranged such that said liquid particles are sprayed in the form of a cone diverging in the direction of the exhaust gas flow.

Claim 19

An exhaust gas cleaning apparatus according to claim 15, wherein said spraying device is disposed in said reaction tower near said means for introducing exhaust gas.

Claim 20

An exhaust gas cleaning apparatus according to claim 15, wherein said spraying device comprises: an inner casing including a liquid supply passage for supplying the liquid containing alkali material, a liquid chamber communicated with said liquid supply passage, a plurality of grooves formed in the outer periphery of said liquid chamber, and a plurality of ports communicating between said liquid chamber and respective grooves; and an outer casing encircling said inner casing, said inner and outer casings defining an air chamber communicated with a gas inlet for the atomizing gas when assembled with said inner casing, said outer casing including a skirt which is in close contact with the portion of said inner casing where said grooves are formed thereby defining the passages for the liquid containing alkali material and the atomizing gas.