Method, apparatus, and system used for purifying and silencing exhaust of internal combustion engine

Abstract

A method for purifying and muffling exhaust gas from an internal combustion engine, comprising the following steps: 1) allowing exhaust gas discharged by the internal combustion engine to enter into the interior of a housing ( 6 ) via an exhaust gas inlet ( 7 ) of the housing ( 6 ), wherein abrupt expansion of cross section occurs from the exhaust gas inlet ( 7 ) to the interior of the housing ( 6 ); 2) allowing scrubbing water which can absorb SO 2 to enter via a scrubbing water inlet ( 11 ), and allowing the exhaust gas in the interior of the housing and the scrubbing water to come into contact with each other, then discharging the scrubbing water via a scrubbing water outlet ( 12 ) of the housing; and 3) discharging the exhaust gas via an exhaust gas outlet ( 10 ) of the housing. The method simultaneously produces effects of purifying SO 2 , muffling and saving energy, and eliminates sparks in the exhaust gas. A device and system for purifying and muffling exhaust gas from an internal combustion engine are also provided.

What is claimed is: 
     
         1 . A method for purifying and muffling exhaust gas from an internal combustion engine, comprising following steps:
 1) allowing exhaust gas discharged by an internal combustion engine to enter into interior of a housing via an exhaust gas inlet of the housing, wherein abrupt expansion of cross section occurs from the exhaust gas inlet to the interior of the housing;   2) allowing scrubbing water that can absorb SO 2  to enter via a scrubbing water inlet of the housing, and allowing the exhaust gas in the interior of the housing and the scrubbing water to come into contact with each other, then discharging the scrubbing water via a scrubbing water outlet of the housing; and   3) discharging the exhaust gas via an exhaust gas outlet of the housing.   
     
     
         2 . The method according to  claim 1 , wherein the scrubbing water that can absorb SO 2  is seawater. 
     
     
         3 . The method according to  claim 2 , wherein the method also comprises a step of transferring seawater from natural waters to the housing. 
     
     
         4 . The method according to  claim 2 , wherein the method also comprises a step of transferring seawater which has been used as cooling water for the internal combustion engine to the housing. 
     
     
         5 . The method according to  claim 1 , wherein the housing is padded with padding materials that can form gaps therebetween. 
     
     
         6 . The method according to  claim 1 , wherein a cross-sectional area of the exhaust gas inlet is 0.05-0.5 times a cross-sectional area of the housing. 
     
     
         7 . The method according to  claim 1 , wherein the method also comprises a step of cooling the exhaust gas by allowing the exhaust gas and the scrubbing water to come into contact with each other. 
     
     
         8 . The method according to  claim 1 , wherein the method also comprises a step of transferring the scrubbing water that has absorbed heat from the exhaust gas to a heat utilization device or a heat exchanger. 
     
     
         9 . The method according to  claim 1 , wherein the method also comprises a step of adjusting a flow rate of the scrubbing water entering the housing. 
     
     
         10 . The method according to  claim 1 , wherein the method also comprises a step of at least partially eliminating NO x  in the exhaust gas before the exhaust gas discharged from the internal combustion engine enters the housing. 
     
     
         11 . The method according to  claim 1 , wherein the exhaust gas and the scrubbing water come into contact with each other in opposite directions. 
     
     
         12 . The method according to  claim 1 , wherein the method also comprises a step of allowing the exhaust gas entering the housing to exchange heat with cooling water encapsulated in a pipeline in the interior of the housing, and transferring hot water or steam generated in the pipeline to a heat utilization device or a heat exchanger. 
     
     
         13 . A device for purifying and muffling exhaust gas from an internal combustion engine, comprising a housing provided with a scrubbing water inlet for allowing scrubbing water to enter into interior of the housing and a scrubbing water outlet for allowing the scrubbing water to be discharged from the housing; wherein the housing is also provided with an exhaust gas inlet for allowing exhaust gas to enter into the interior of the housing and an exhaust gas outlet for allowing the exhaust gas to be discharged from the housing, the scrubbing water inlet, the scrubbing water outlet, the exhaust gas inlet and the exhaust gas outlet are all arranged to enable the scrubbing water and the exhaust gas to come into contact in the interior of the housing, and abrupt expansion of cross section occurs from the exhaust gas inlet to the interior of the housing. 
     
     
         14 . The device according to  claim 13 , wherein the housing is padded with padding materials that can form gaps therebetween. 
     
     
         15 . The device according to  claim 13 , wherein a cross-sectional area of the exhaust gas inlet is 0.05-0.5 times a cross-sectional area of the housing. 
     
     
         16 . The device according to  claim 13 , wherein the device also comprises a component for cooling the exhaust gas. 
     
     
         17 . The device according to  claim 13 , wherein the device also comprises a component for adjusting influent flow rate of the scrubbing water. 
     
     
         18 . The device according to  claim 13 , wherein the interior of the housing is also provided with a cooling pipeline, and an inlet and an outlet of the cooling pipeline communicate with exterior of the housing. 
     
     
         19 . A system for purifying and muffling exhaust gas from an internal combustion engine, comprising an internal combustion engine exhaust passage, wherein the system also comprises a device for purifying and muffling the exhaust gas from the internal combustion engine according to  claim 13 , and the device for purifying and muffling the exhaust gas from the internal combustion engine is mounted in the internal combustion engine exhaust passage. 
     
     
         20 . The system according to  claim 19 , wherein the system also comprises a denitration device mounted in the internal combustion engine exhaust passage and located upstream of the device for purifying and muffling the exhaust gas from the internal combustion engine. 
     
     
         21 . The system according to  claim 19 , wherein the system also comprises a heat utilization device or heat exchanger, and a pipeline used for transferring fluid in the housing to the heat utilization device or the heat exchanger. 
     
     
         22 . The system according to  claim 19 , wherein the system also comprises a device for transferring seawater from natural waters to the housing. 
     
     
         23 . The system according to  claim 19 , wherein the system also comprises a device for transferring internal combustion engine cooling water to the housing. 
     
     
         24 . The system according to  claim 19 , wherein the system also comprises a device for adjusting influent flow rate of the scrubbing water. 
     
     
         25 . A system for purifying and muffling exhaust gas from an internal combustion engine, comprising an internal combustion engine exhaust passage, wherein the system comprises a device for purifying and muffling the exhaust gas from the internal combustion engine according to  claim 18 , and the device for purifying and muffling the exhaust gas from the internal combustion engine is mounted in the internal combustion engine exhaust passage. 
     
     
         26 . The system according to  claim 25 , wherein the system also comprises a first heat utilization device or a first heat exchanger, and a pipeline for transferring fluid in the housing to the first heat utilization device or the first heat exchanger; the system also comprises a second heat utilization device or a second heat exchanger, and a pipeline for transferring fluid in the cooling pipeline to the second heat utilization device or the second heat exchanger. 
     
     
         27 . A method for purifying and muffling exhaust gas from an internal combustion engine, comprising the following steps:
 1) allowing exhaust gas discharged from an internal combustion engine to enter into interior of a housing via an exhaust gas inlet of the housing;   2) allowing scrubbing water that can absorb SO 2  to enter via a scrubbing water inlet of the housing, and allowing the exhaust gas in the interior of the housing and the scrubbing water to come into contact with each other, and then discharging the scrubbing water via a scrubbing water outlet of the housing; and   3) discharging the exhaust gas via an exhaust gas outlet of the housing;   the method further comprising cooling the exhaust gas by allowing the exhaust gas and the scrubbing water to come into contact with each other.   
     
     
         28 . A method for eliminating sparks in exhaust gas from an internal combustion engine of a vessel, comprising the following steps:
 1) allowing exhaust gas discharged from an internal combustion engine to enter into interior of a housing via an exhaust gas inlet of the housing, wherein abrupt expansion of cross section occurs from the exhaust gas inlet to the interior of the housing;   2) allowing scrubbing water that can absorb SO 2  to enter via a scrubbing water inlet of the housing, and allowing the exhaust gas in the interior of the housing and the scrubbing water to come into contact with each other, and then discharging the scrubbing water via a scrubbing water outlet of the housing; and   3) discharging the exhaust gas via an exhaust gas outlet of the housing.   
     
     
         29 . A method for eliminating sparks in exhaust gas from an internal combustion engine of a vessel, comprising the following steps:
 1) allowing exhaust gas from an internal combustion engine to enter into interior of a housing via an exhaust gas inlet of the housing;   2) allowing scrubbing water that can absorb SO 2  to enter via a scrubbing water inlet of the housing, and allowing the exhaust gas in the interior of the housing and the scrubbing water to come into contact with each other, and then discharging the scrubbing water via a scrubbing water outlet of the housing; and   3) discharging the exhaust gas via an exhaust gas outlet of the housing;   the method further comprising cooling the exhaust gas by allowing the exhaust gas and the scrubbing water to come into contact with each other.