[0019] First of all, according to the requirements of desulfurization of diesel engine exhaust gas in the process of sailing and leaving the port, the water tank (4) and the lye tank (5) in the system store sufficient lye and water, and the water tank (4) and the neutralization processor ( 3) Connect with the cleaning and dosing water delivery and measurement and control device (13) through the pipeline. The lye tank (5) is connected to the neutralization processor (3) through pipelines and lye delivery and the measurement and control device (14), and the lye and water are input into the neutralization processor (3) to prepare desulfurization at the required concentration. aqueous solution.
[0020] The exhaust gas discharged during the working process of the marine diesel engine is firstly cooled to below 80 degrees by heat exchange, and then enters the middle and lower part of the washing tank (1) through the air inlet channel.
[0021] The spray device in the upper part of the washing tank (1) sprays out the desulfurization aqueous solution containing sodium hydroxide droplets densely. These droplets contact and collide with the sulfur oxide-containing exhaust gas moving upwards, fully dissolve and absorb sulfur oxides, and then fall to the Scrub the bottom of the kettle. After the desulfurization treatment, the gas containing fine droplets is removed through the demister on the upper part of the spraying device to prevent them from being discharged out of the washing tank, so as to ensure that the discharged gas after treatment meets the emission standard.
[0022] The spray liquid in the washing kettle (1) is supplied by the neutralization processor (3) through the spray liquid delivery and measurement and control device (9), the spray liquid control unit (10), and the spray liquid control unit (11).
[0023] The spray liquid in the washing tank (1) absorbs the sulfur oxides in the exhaust gas and falls to the bottom of the tank, and the mixed solution absorbed by the sulfur oxides at the bottom of the washing tank is fed into the tank by the circulating liquid delivery and measurement and control device (12). And processor (3) further generates sulfate with lye neutralization reaction. If the sulfate has not reached the saturation or the set concentration, it will be transported to the spray device in the washing tank through the spray liquid delivery and measurement and control device (9), spray liquid control unit (10), (11), and then passed through the nozzle ( Nozzle) spray continues to neutralize and absorb sulfur oxides in the exhaust gas.
[0024] If the sulfate in the mixed solution in the neutralization processor (3) reaches saturation or the set concentration and pollutant content reach a certain value, the mixed solution delivery and measurement and control device will pass through the output pipeline at the lower part of the neutralization processor (3). (15) enters the solid-liquid separator (6).
[0025]The solid-liquid separator (6) separates the particulate dirt in the mixed liquid from the saturated liquid, and the separated liquid is transported to the saturated liquid tank (7) through the saturated liquid delivery and measurement and control device (16). The sulfate saturated liquid is transported to be treated as a sulfate chemical raw material. The sewage separated by the solid-liquid separator (6) is transported to the sewage discharge bin (8) through the sewage discharge conveying device (17), and the sewage is discharged for treatment after the ship arrives at the shore.
[0026] The circulation fluid delivery and measurement and control device (12) between the bottom of the spray washing desulfurization kettle (1) and the neutralization processor (3), the main delivery pipeline of the circulation fluid delivery and measurement and control device (12) based on the reliability design ( 26) Two circulating fluid delivery pumps (19) and (20) are installed in parallel, which greatly reduces the failure probability of circulating fluid delivery and measurement and control devices. When one of the circulating fluid delivery pumps (19, 20) fails, the other circulation The normal operation of the liquid transfer pump ensures the high reliability of the system.
[0027] The two circulating fluid delivery pumps (19), (20) installed in parallel on the main delivery pipeline (26) of the circulating fluid delivery and measurement and control device (12) are respectively equipped with frequency converters (21), (22) to realize motor frequency conversion Driven by speed regulation, the computer of the control system controls the delivery flow of the pump by automatically adjusting the speed of the variable frequency motor according to the needs of the system operation.
[0028] In the circulating fluid delivery and measurement and control device (12), two acid and alkali-resistant flow sensors (23) and (24) connected in series on the outlet main circuit of the circulating fluid delivery pump (19), (20) are arranged, and the circulating fluid delivery pump (19) ), (20) the circulating fluid flow information sent to the neutralization processor (3) is transmitted to the system control computer in real time, and the speed of the variable frequency motor is automatically controlled according to the operation of the equipment to control the pump delivery flow. When one of the two series-connected acid-resistant liquid flow sensors (23) (24) fails, the other sensor operates normally, ensuring high reliability of the system.
[0029] Circulating fluid delivery and measurement and control device (12), respectively set catheter interface on the inlet main pipeline (26) of circulating fluid delivery pump (19) and (20), the catheter is equipped with manual valve (27), when the equipment is running, Manual valve (27) is closed. When the circulating liquid delivery pump (19) or (20) fails and needs to be repaired, close the manual valve at the outlet of the neutralization processor (3), connect the inlet pipe of the mobile diversion pump (28) to the catheter port, open the manual valve, and start The diversion pump guides the circulating fluid remaining in the delivery pumps (19), (20) and the main circuit into the neutralization processor (3), which is convenient for quick maintenance or replacement of the circulating fluid delivery pump, and avoids overflow of circulating fluid in the pipeline and container Causing liquid accumulation in the cabin or deck and affecting the failure of surrounding equipment.
[0030] The invention has the beneficial effects of: realizing high-reliability operation of marine diesel engine exhaust gas desulfurization equipment, better maintenance performance, meeting marine diesel engine exhaust gas desulfurization requirements, and meeting the marine diesel engine exhaust gas emission standard required by IMO.
