CN217340797U - A marine wet flue gas combined desulfurization and denitrification integrated circulation system - Google Patents

Abstract

The utility model discloses a marine wet flue gas combined desulfurization and denitrification integrated circulating system, which comprises a desulfurization and denitrification washing unit, a cleaning solution recovery unit, a NaClO supply unit and a cleaning solution mixing unit; the cleaning solution outlet end of the desulfurization and denitrification washing unit is in fluid communication with the cleaning solution inlet end of the cleaning solution recovery unit, the organic phase outlet end of the cleaning solution recovery unit is in fluid communication with the organic phase inlet end of the cleaning solution mixing unit, the direct circulating aqueous phase outlet end of the cleaning solution recovery unit is in fluid communication with the direct circulating aqueous phase inlet end of the cleaning solution mixing unit, and the indirect circulating aqueous phase outlet end of the cleaning solution recovery unit is in fluid communication with the indirect circulating aqueous phase inlet end of the NaClO supply unit; the NaClO solution outlet end of the NaClO supply unit is in fluid communication with the NaClO solution inlet end of the washing liquid mixing unit. The utility model discloses simple structure and compactness, area is little, and environment friendly.

Description

A marine wet flue gas combined desulfurization and denitrification integrated circulation system

technical field

The utility model relates to the technical field of flue gas desulfurization and denitration. Specifically, it is a marine wet flue gas combined desulfurization and denitrification integrated circulation system.

Background technique

With the rapid development of the global economy, ocean transportation plays an important role in international trade due to its large capacity and low operating costs. However, the large amount of sulfur dioxide (SO ₂ ) and nitrogen oxides (NO _X ) emitted by marine diesel engines cannot be ignored on the environment and human health. Marine diesel engines emit about 20 million tons of NO _X and 10 million tons of SO ₂ every year, which can cause serious environmental problems such as acid rain, smog, photochemical smog, tropospheric ozone, etc., and endanger human health and increase respiratory and cardiovascular related diseases .

To reduce these harmful emissions, the International Maritime Organization (IMO) and governments have set stricter emission standards. As strict marine emission regulations come into effect, ships must use more efficient exhaust gas treatment technologies, which will pose a huge challenge to the shipbuilding industry. At present, most ship repair yards connect denitrification devices such as selective catalytic reduction (SCR) or exhaust gas recirculation (EGR) in series with desulfurization devices such as desulfurization scrubbers, and use a gradual removal process to achieve the purpose of emission reduction.

However, the system equipment required by this step-by-step removal process not only covers a large area, but also has a complex system and high investment and operating costs, which limit its large-scale application on ships. In addition, SCR has the problem of ammonia leakage, the catalyst material is easy to scale, block and poison, and the denitration process is affected by factors such as flue gas temperature and SO ₂ concentration. In addition, EGR suffers from incomplete combustion of fuel, which increases CO and PM emissions. Therefore, it is necessary to develop better and efficient desulfurization and denitrification technologies to meet the needs of shipyards.

Patent CN113856445A discloses a two-phase continuous absorption system and method composed of a flue gas desulfurization and denitrification aqueous oxidant and an organic phase absorbent, but it must be used in practice with the relevant flue gas desulfurization and denitration system.

Utility model content

Therefore, the technical problem to be solved by this utility model is to provide a marine wet flue gas combined desulfurization and denitrification integrated circulation system, which can cooperate with the application of the dual-phase continuous absorption system of flue gas desulfurization and denitrification, so that the dual-phase continuous absorption system can be used in the flue gas. The desulfurization and denitrification system can be recycled to achieve the purpose of continuous desulfurization and denitrification, so as to solve the problem that the existing ship desulfurization and denitrification system cannot realize the combination of synchronous desulfurization and denitrification technology and electrolytic seawater technology.

In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions:

A marine wet flue gas combined desulfurization and denitrification integrated circulation system includes a desulfurization and denitration washing unit, a washing liquid recovery unit, a NaClO supply unit and a washing liquid mixing unit; the washing liquid outlet of the desulfurization and denitration washing unit is connected with the washing liquid. The washing liquid inlet end of the recovery unit is in fluid communication, the organic phase outlet end of the washing liquid recovery unit is in fluid communication with the organic phase inlet end of the washing liquid mixing unit, and the directly circulating water phase outlet of the washing liquid recovery unit The end is in fluid communication with the direct circulation water phase inlet end of the washing liquid mixing unit, and the indirect circulation water phase outlet end of the washing liquid recovery unit is in fluid communication with the indirect circulation water phase inlet end of the NaClO supply unit; The NaClO solution outlet end of the NaClO supply unit is in fluid communication with the NaClO solution inlet end of the washing liquid mixing unit, and the desulfurization and denitration washing liquid outlet end of the washing liquid mixing unit is connected with the desulfurization and denitration washing liquid of the desulfurization and denitration washing liquid. The inlet end is in fluid communication, and the supplementary brine inlet end of the NaClO supply unit is in fluid communication with the seawater desalination retentate liquid inlet pipe; the flue gas inlet end of the desulfurization and denitrification washing unit is in fluid communication with the flue gas intake pipe, so The flue gas outlet end of the desulfurization and denitration washing unit is in fluid communication with the flue gas outlet pipe.

In the above-mentioned marine wet flue gas combined desulfurization and denitrification integrated circulation system, the desulfurization and denitrification washing unit includes a washing tower and a cooler; the flue gas outlet end of the cooler is in fluid communication with the air inlet of the washing tower; the The flue gas inlet end of the cooler is in fluid communication with the flue gas inlet pipe; the liquid outlet of the washing tower is in fluid communication with the washing liquid inlet end of the washing liquid recovery unit through the washing liquid recovery pipe, and the The gas outlet of the scrubbing tower is in fluid communication with the flue gas outlet pipe, and the liquid inlet of the scrubbing tower is in fluid communication with the desulfurization and denitration scrubbing liquid outlet end of the scrubbing liquid mixing unit through the scrubbing liquid inlet pipe.

In the above marine wet flue gas combined desulfurization and denitrification integrated circulation system, the washing tower includes a washing tower body, a washing liquid nozzle and a stirring assembly; the washing liquid nozzle is fixedly installed inside the washing tower body and adjacent to the liquid inlet , the stirring assembly is fixedly installed inside the washing tower body and adjacent to the liquid outlet, and the fluid inlet end of the washing liquid nozzle is in fluid communication with the washing liquid inlet pipe through the liquid inlet, so The fluid outlet end of the washing liquid nozzle faces the stirring assembly; the liquid inlet and the air outlet are respectively arranged on the upper part of the side wall of the washing tower body, and the inlet and the liquid outlet are respectively arranged in the lower part of the side wall of the washing tower body.

The above-mentioned marine wet flue gas combined desulfurization and denitrification integrated circulation system, the air outlet is fixedly installed with a mist eliminator, and the flue gas flows through the mist eliminator from bottom to top along the interior of the washing tower body, and then passes through the outlet. The gas port enters the flue gas outlet pipe;

The stirring assembly includes a motor, a rotating shaft and a helical blade; the motor is installed outside the washing tower body, the motor is drivingly connected with the first end of the rotating shaft, and the second end of the rotating shaft passes through the washing tower The tower body extends into the washing tower body, and the spiral blade is fixedly installed on the second end of the rotating shaft.

The above-mentioned marine wet flue gas combined desulfurization and denitration integrated circulation system, the horizontal distance between the liquid inlet and the air inlet is equal to the inner diameter of the washing tower body; the washing liquid nozzles have two or more groups, two or more. The washing liquid nozzles of one or more groups are distributed at equal intervals from top to bottom in the washing tower body; each group of the washing liquid nozzles has two or more, and two or more The washing liquid nozzles are distributed at equal intervals on the same level.

In the above marine wet flue gas combined desulfurization and denitrification integrated circulation system, the washing liquid recovery unit includes a first centrifuge, a second centrifuge, a water phase storage tank, a concentration feedback controller, a VOCs/PM collection bin, a heater, a settling a pool, a first water-phase circulating pump and a second water-phase circulating pump;

The organic phase outlet end of the first centrifuge is in fluid communication with the fluid inlet end of the second centrifuge through the first organic phase recovery pipeline, and the first fluid outlet end of the second centrifuge passes through the second organic phase. The recovery pipeline is in fluid communication with the organic phase inlet end of the washing liquid mixing unit, and the second fluid outlet end of the second centrifuge is in fluid communication with the VOCs/PM collection bin;

The water phase outlet end of the first centrifuge is in fluid communication with the fluid inlet end of the water phase storage tank through the first water phase recovery pipeline, and the fluid outlet end of the water phase storage tank passes through the first water phase The circulating pump is in fluid communication with the fluid inlet end of the concentration feedback controller; the first fluid outlet end of the concentration feedback controller is in fluid communication with the fluid inlet end of the heater, and the fluid outlet end of the heater is in fluid communication. The second water phase recovery pipeline is in fluid communication with the fluid inlet end of the sedimentation tank, and the fluid outlet end of the sedimentation tank is supplied with the NaClO through the second water phase circulation pump and the fourth water phase recovery pipeline in turn. The indirect circulating water phase inlet end of the unit is in fluid communication; the second fluid outlet end of the concentration feedback controller is in fluid communication with the direct circulating water phase inlet end of the washing liquid mixing unit through the third water phase recovery pipeline;

The inlet end of the washing liquid of the first centrifuge is in fluid communication with the outlet end of the washing liquid of the desulfurization and denitration washing unit.

In the above marine wet flue gas combined desulfurization and denitrification integrated circulation system, the concentration feedback controller includes a concentration feedback pipeline, a pH sensor, a salinity sensor, a signal feedback control element and an electric three-way control valve; the pH sensor and the salt The degree sensors are fixedly installed on the concentration feedback pipe, the fluid inlet end of the electric three-way control valve is in fluid communication with the fluid outlet end of the concentration feedback pipe; the first fluid outlet of the electric three-way control valve The second fluid outlet end of the electric three-way control valve is in fluid communication with the fluid inlet end of the heater, and the second fluid outlet end of the electric three-way control valve is connected to the direct circulation water phase inlet end of the washing liquid mixing unit through the third water phase recovery pipeline. The fluid is connected; the detection end of the pH sensor is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the pH sensor is electrically connected with the pH signal input end of the signal feedback control element; the salinity sensor The detection end of the sensor is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the salinity sensor is electrically connected to the salinity signal input end of the signal feedback control element; the signal feedback control element controls the electric The opening and closing of the first fluid outlet end and the second fluid outlet end of the three-way control valve controls the flow of the fluid in the concentration feedback pipe to the heater or the washing liquid mixing unit; the fluid outlet of the water phase storage tank The end is in fluid communication with the fluid inlet end of the concentration feedback pipe through the first water-phase circulating pump.

The above-mentioned marine wet flue gas combined desulfurization and denitrification integrated circulation system, the NaClO supply unit includes a bipolar membrane electrolytic cell, a NaClO storage tank and a NaClO solution circulating pump; the fluid outlet end of the bipolar membrane electrolytic cell and the NaClO storage The fluid inlet end of the tank is in fluid communication, and the NaClO solution outlet end of the NaClO storage tank is in fluid communication with the NaClO solution inlet end of the washing liquid mixing unit through the NaClO liquid outlet pipeline and the NaClO solution circulating pump in turn; the The inlet end of the supplementary brine of the bipolar membrane electrolytic cell is in fluid communication with the inlet pipe of the seawater desalination retentate, and the inlet end of the indirect circulating water phase of the bipolar membrane electrolytic cell is connected to the indirect circulating water phase of the washing liquid recovery unit. The outlet port is fluidly connected.

In the above marine wet flue gas combined desulfurization and denitrification integrated circulation system, the bipolar membrane electrolytic cell includes an electrolytic cell body, a first titanium mesh, a second titanium mesh and an ion exchange membrane; the ion exchange membrane connects the electrolytic cell body Divided into two spaces, the first titanium mesh and the second titanium mesh are respectively located in the two spaces, the first titanium mesh is electrically connected to the positive pole of the DC power source, and the second titanium mesh is electrically connected to the negative pole of the DC power supply. connection; the side wall of the electrolytic cell body is respectively provided with a first liquid inlet, a second liquid inlet and a liquid outlet; the indirect circulating water phase outlet of the washing liquid recovery unit passes through the first liquid inlet The port is in fluid communication with the electrolytic cell body, the seawater desalination retentate liquid inlet pipeline is in fluid communication with the electrolytic cell body through the second liquid inlet, and the electrolytic cell body is in fluid communication with the electrolytic cell body through the liquid outlet. The NaClO storage tank is in fluid conduction.

In the above marine wet flue gas combined desulfurization and denitrification integrated circulation system, the washing liquid mixing unit includes a washing liquid mixing tank and a washing liquid circulating pump; the desulfurization and denitrification washing liquid outlet of the washing liquid mixing tank passes through the washing liquid circulating pump It is in fluid communication with the inlet end of the desulfurization and denitrification washing liquid of the desulfurization and denitration washing unit; the inlet end of the direct circulating water phase of the washing liquid mixing tank is in fluid communication with the outlet end of the direct circulating water phase of the washing liquid recovery unit, so The organic phase inlet end of the washing liquid mixing tank is in fluid communication with the organic phase outlet end of the washing liquid recovery unit, and the NaClO solution inlet end of the washing liquid mixing tank is in fluid communication with the NaClO solution outlet end of the NaClO supply unit. Pass.

The technical scheme of the present utility model has achieved the following beneficial technical effects:

1. The marine wet flue gas combined desulfurization and denitrification integrated circulation system in the utility model can realize the combination of the synchronous desulfurization and denitrification technology and the electrolytic seawater technology, simplify the traditional step-by-step desulfurization and denitrification equipment unit, thereby realizing the marine wet flue gas desulfurization and denitrification integration. System design: The system consists of four parts: desulfurization and denitration washing unit, washing liquid recovery unit, NaClO supply unit and washing liquid mixing unit. The set of centrifuges separate the aqueous phase and the organic phase in the washing waste liquid after washing, which can improve the utilization rate of the aqueous phase oxidant and the organic phase absorbent, prevent the discharge of the organic phase absorbent, and reduce the pollution of the washing waste liquid to the environment. .

2. The utility model can realize that the retentate of electrolysis seawater desalination and the recovered water-phase washing waste liquid on the ship can be turned into treasures, so as to achieve the purpose of recycling the water-phase oxidant, and can make full use of seawater resources and remaining electric power during navigation. resources, reducing the risk of carrying chemicals and storing on board; the marine wet flue gas combined desulfurization and denitrification integrated circulation system of the utility model has a simple and compact structure, and the equipment occupies a small area and is environmentally friendly.

3. The first centrifuge can separate the organic phase and the aqueous phase in the two-phase washing waste liquid with different rotation speeds, and the second centrifuge can use different rotation speeds to separate the organic phase obtained from the separation. The completely burned carbon particles and heavy oil are further separated, and then the separated organic phase is recycled into the washing liquid mixing tank for the preparation of two-phase washing liquid; and the separated water phase is monitored by the concentration feedback controller. If the concentration of the water phase meets the concentration requirements of the two-phase washing liquid, it is recycled to the washing liquid mixing tank for the preparation of the two-phase washing liquid; otherwise, the water phase is recycled to the NaClO supply unit for further processing until it meets the application requirements. Piped to wash liquor mixing tank for preparation of biphasic wash liquor. This recycling system can effectively separate and collect the organic waste after desulfurization and denitrification in the flue gas, and can recycle the organic phase and the water phase that meet the application requirements, which can not only improve the application efficiency of the dual-phase washing solution, but also save resources. , Environmentally friendly.

4. The addition of organic phase absorbent to the dual-phase washing liquid in the present utility model can well absorb the nitric acid and nitrous acid generated in the denitration process and increase the denitration efficiency; and the organic phase added can also absorb the unburned carbon in the flue gas. Granules and heavy oil, reduce PM and VOCs emissions.

Description of drawings

Fig. 1 is the structural representation of the integrated circulation system of marine wet flue gas combined desulfurization and denitrification in the embodiment of the present utility model;

2 is a schematic structural diagram of the desulfurization, denitrification and washing unit of the marine wet flue gas combined desulfurization and denitrification integrated circulation system in the embodiment of the present utility model;

3 is a schematic structural diagram of the concentration feedback controller of the marine wet flue gas combined desulfurization and denitrification integrated circulation system in the embodiment of the present invention;

4 is a schematic structural diagram of a bipolar membrane electrolysis cell of a marine wet flue gas combined desulfurization and denitrification integrated circulation system in an embodiment of the present invention.

The reference signs in the figure are: 1- flue gas intake pipe; 2- cooler; 3- washing tower; 4- washing liquid nozzle; 5- stirring assembly; 6- demister; 7- flue gas outlet pipe; 8-washing liquid inlet pipe; 9-washing liquid recovery pipe; 10-first centrifuge; 11-second centrifuge; 12-water phase storage tank; 13-first water-phase circulating pump; 14-concentration feedback control 15-VOCs/PM collection bin; 16-heater; 17-settling tank; 18-second water-phase circulating pump; 19-first organic phase recovery pipeline; 20-first water-phase recovery pipeline; 21-th Two organic phase recovery pipeline; 22-second water phase recovery pipeline; 23-third water phase recovery pipeline; 24-fourth water phase recovery pipeline; 25-bipolar membrane electrolysis cell; 26-NaClO storage tank; 27-seawater 28-NaClO solution circulation pump; 29-NaClO outlet pipe; 30-washing liquid mixing tank; 31-washing liquid circulation pump; 32-pH sensor; 33-salinity sensor; 34-signal feedback Control element; 35-electric three-way control valve; 36-first titanium mesh; 37-second titanium mesh; 38-ion exchange membrane.

Detailed ways

The schematic structural diagram of the marine wet flue gas combined desulfurization and denitrification integrated circulation system in this embodiment is shown in Figure 1, including a desulfurization and denitrification washing unit, a washing liquid recovery unit, a NaClO supply unit, and a washing liquid mixing unit.

As shown in Figure 2, the desulfurization and denitration washing unit includes a washing tower 3 and a cooler 2 [the cooler is a common device in the prior art that can cool the flue gas]; the flue gas outlet end of the cooler 2 It is in fluid communication with the air inlet of the washing tower 3; the flue gas inlet end of the cooler 2 is in fluid communication with the flue gas inlet pipe 1; the liquid outlet of the washing tower 3 is recovered by the washing liquid The pipeline 9 is in fluid communication with the washing liquid inlet end of the washing liquid recovery unit, the gas outlet of the washing tower 3 is in fluid communication with the flue gas outlet pipeline 7, and the liquid inlet of the washing tower 3 passes through the washing liquid. The liquid inlet pipe 8 is in fluid communication with the outlet end of the desulfurization and denitration washing liquid of the washing liquid mixing unit.

The washing tower 3 includes a washing tower body, a washing liquid spray head 4 and a stirring assembly 5; the washing liquid spray head 4 is fixedly installed inside the washing tower body and adjacent to the liquid inlet, and the stirring assembly 5 is fixedly installed on the inside of the washing tower body. Inside the washing tower body and adjacent to the liquid outlet, the fluid inlet end of the washing liquid nozzle 4 is in fluid communication with the washing liquid inlet pipe 8 through the liquid inlet. The fluid outlet end faces the stirring assembly 5; the liquid inlet and the air outlet are respectively arranged on the upper part of the side wall of the washing tower body, and the inlet and the liquid outlet are respectively arranged on the washing The lower part of the side wall of the tower body; the horizontal distance between the liquid inlet and the air inlet is equal to the inner diameter of the washing tower body; the washing liquid spray heads 4 have four groups, and the four groups of the washing liquid spray heads 4 are located at the The washing tower body is distributed at equal intervals from top to bottom; there are 5 washing liquid nozzles 4 in each group, and the five washing liquid nozzles 4 are distributed at equal intervals on the same horizontal plane, and the washing liquid nozzles are staggered up and down.

The mist eliminator 6 is fixedly installed at the air outlet [the mist eliminator is a commonly used mist eliminator in the field of flue gas wet desulfurization], and the flue gas flows through the mist eliminator from bottom to top along the interior of the scrubbing tower body. 6 and then enter the flue gas outlet pipe 7 through the air outlet, the setting of the mist eliminator can effectively reduce the loss of the two-phase washing liquid; the stirring assembly 5 includes a motor, a rotating shaft and a spiral blade; the motor is installed in the Outside the washing tower body, the motor is drivingly connected to the first end of the rotating shaft, the second end of the rotating shaft passes through the washing tower body and extends into the washing tower body, and the spiral blades are fixed It is installed on the second end of the rotating shaft; the stirring component 5 is used to mix the two-phase washing waste liquid after participating in the flue gas desulfurization and denitrification reaction evenly, wherein the motor speed is controlled to be 500-1500rpm.

The washing liquid recovery unit includes a first centrifuge 10, a second centrifuge 11, a water phase storage tank 12, a concentration feedback controller 14, a VOCs/PM collection bin 15, a heater 16, a sedimentation tank 17, a first water phase The circulating pump 13 and the second water-phase circulating pump 18; the inlet end of the washing liquid of the first centrifuge 10 and the liquid outlet of the washing tower 3 are in fluid communication through the washing liquid recovery pipe 9.

The organic phase outlet end of the first centrifuge 10 is in fluid communication with the fluid inlet end of the second centrifuge 11 through the first organic phase recovery pipe 19, and the first fluid outlet end of the second centrifuge 11 passes through. The second organic phase recovery pipeline 21 is in fluid communication with the organic phase inlet end of the washing liquid mixing unit, and the second fluid outlet end of the second centrifuge 11 is in fluid communication with the VOCs/PM collection bin 15;

The water phase outlet end of the first centrifuge 10 is in fluid communication with the fluid inlet end of the water phase storage tank 12 through the first water phase recovery pipeline 20, and the fluid outlet end of the water phase storage tank 12 passes through the The first water-phase circulating pump 13 is in fluid communication with the fluid inlet end of the concentration feedback controller 14; the first fluid outlet end of the concentration feedback controller 14 is in fluid communication with the fluid inlet end of the heater 16, The fluid outlet end of the heater 16 is in fluid communication with the fluid inlet end of the sedimentation tank 17 through the second water phase recovery pipe 22, and the fluid outlet end of the sedimentation tank 17 passes through the second water phase circulating pump in turn. 18 and the fourth water phase recovery pipeline 24 are in fluid communication with the indirect circulating water phase inlet end of the NaClO supply unit; the second fluid outlet end of the concentration feedback controller 14 is connected to the The inlet end of the direct circulating water phase of the washing liquid mixing unit is in fluid communication.

As shown in FIG. 3 , the concentration feedback controller 14 includes a concentration feedback pipeline, a pH sensor 32, a salinity sensor 33, a signal feedback control element 34 and an electric three-way control valve 35; the pH sensor 32 and the salinity The sensors 33 are all fixedly installed on the concentration feedback pipeline, and the fluid inlet end of the electric three-way control valve 35 is in fluid communication with the fluid outlet end of the concentration feedback pipeline; the first The fluid outlet end is in fluid communication with the fluid inlet end of the heater 16, and the second fluid outlet end of the electric three-way control valve 35 is directly connected to the washing liquid mixing unit through the third water phase recovery pipe 23. The inlet end of the circulating water phase is fluidly connected; the detection end of the pH sensor 32 is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the pH sensor 32 is connected to the pH signal input end of the signal feedback control element 34 Electrical connection; the detection end of the salinity sensor 33 is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the salinity sensor 33 is electrically connected to the salinity signal input end of the signal feedback control element 34; The signal feedback control element 34 controls the flow of the fluid in the concentration feedback pipe to the heater 16 or the Washing liquid mixing unit; the fluid outlet end of the water phase storage tank 12 is in fluid communication with the fluid inlet end of the concentration feedback pipeline through the first water phase circulating pump 13 . The signal feedback control element 34 used in this embodiment is an industrial computer.

The NaClO supply unit comprises a bipolar membrane electrolytic cell 25, a NaClO storage tank 26 and a NaClO solution circulation pump 28; the fluid outlet end of the bipolar membrane electrolytic cell 25 is in fluid communication with the fluid inlet end of the NaClO storage tank 26 , the NaClO solution outlet end of the NaClO storage tank 26 is in fluid communication with the NaClO solution inlet end of the washing liquid mixing unit through the NaClO outlet pipe 29 and the NaClO solution circulation pump 28 in turn; the bipolar membrane electrolytic cell The supplementary brine inlet port 25 is in fluid communication with the seawater desalination retentate liquid inlet pipe 27, and the indirect circulating water phase inlet port of the bipolar membrane electrolytic cell 25 passes through the fourth water phase recovery pipe 24 and the second water phase recovery pipe in turn. The water phase circulation pump 18 is in communication with the fluid.

As shown in FIG. 4 , the bipolar membrane electrolytic cell 25 includes an electrolytic cell body, a first titanium mesh 36 [the first titanium mesh is coated with RuO ₂ and IrO ₂ ], a second titanium mesh 37 and an ion exchange membrane 38 [ The ion exchange membrane is a perfluorosulfonic acid ion exchange membrane]; the ion exchange membrane 38 divides the electrolytic cell body into two spaces, and the first titanium mesh 36 and the second titanium mesh 37 are located in the two spaces respectively Inside, the first titanium mesh 36 is electrically connected to the positive pole of the DC power supply, and the second titanium mesh 37 is electrically connected to the negative pole of the DC power supply; the side walls of the electrolytic cell body are respectively provided with a first liquid inlet and a second liquid inlet. A liquid inlet and a liquid outlet; the sedimentation tank 17 of the washing liquid recovery unit is in fluid communication with the electrolytic cell body through the first liquid inlet, and the seawater desalination retentate liquid inlet pipe 27 passes through the first liquid inlet. The second liquid inlet is in fluid communication with the electrolytic cell body, and the electrolytic cell body is in fluid communication with the NaClO storage tank 26 through the liquid outlet.

The washing liquid mixing unit includes a washing liquid mixing tank 30 [the washing liquid mixing tank is a device with fluid mixing function] and a washing liquid circulating pump 31; the desulfurization and denitration washing liquid outlet of the washing liquid mixing tank 30 passes through the washing liquid. The liquid circulation pump 31 and the washing liquid inlet pipeline 8 are in fluid communication with the liquid inlet of the washing tower 3 of the desulfurization and denitration washing unit; the direct circulation water phase inlet end of the washing liquid mixing tank 30 is recovered by the third water phase The pipeline 23 is in fluid communication with the concentration feedback controller 14 of the washing liquid recovery unit, and the organic phase inlet end of the washing liquid mixing tank 30 passes through the second organic phase recovery pipeline 21 and the second centrifugal force of the washing liquid recovery unit. The machine 11 is in fluid communication, and the NaClO solution inlet end of the washing liquid mixing tank 30 is in fluid communication with the NaClO solution outlet end of the NaClO supply unit NaClO storage tank 26 .

In this embodiment, the motor, the mist eliminator, the first centrifuge, the second centrifuge, the signal feedback control element, the electrode material, and the ion exchange membrane are all commercially available. Personnel only need to install and operate according to the accompanying instruction manual, which will not be repeated in the manual; in the above embodiment, the different rotational speeds of the centrifuge are separately determined according to different types of organic phase absorbents; The methods or setting methods are common mechanical methods, and can be implemented as long as the beneficial effects can be achieved.

work process:

1. The flue gas discharged from the ship enters the cooler 2 through the flue gas intake pipe 1 to be cooled to 110-140 ° C. After cooling, the flue gas enters the washing tower 3 from the cooler 2 and flows from bottom to top, while the washing tower The 4 groups of washing liquid nozzles 4 in 3 are turned on, and the washing liquid is sprayed from top to bottom in the washing tower 3. During the process of flue gas flowing upwards, the sulfur-containing and nitrite-containing substances in the flue gas are fully reacted with the washing liquid. Among them, NO and SO ₂ in the flue gas can be effectively oxidized by the aqueous oxidant, and the nitric acid and nitrous acid generated by NO oxidation can be effectively absorbed by the organic phase absorbent, so as to achieve the purpose of desulfurization and denitrification, and the organic phase absorbent can adsorb The unburned carbon particles and heavy oil in the flue gas can effectively reduce PM and VOCs emissions; after the flue gas is desulfurized and denitrified, the mist is removed by the mist eliminator 6, so that the washing liquid entrained in the flue gas stays in the washing tower. , reduce the loss of washing liquid, increase the utilization efficiency of washing liquid, and the flue gas after desulfurization and denitrification and after demisting is discharged from the flue gas outlet pipe to complete the desulfurization and denitrification of flue gas;

2. The washing liquid in the washing tower 3 flows down to the bottom of the washing tower 3 due to the adsorption of sulfur-containing and nitrate-containing substances, and the stirring component 5 at the bottom runs at a high speed. After the phase washing waste liquid is evenly mixed, it enters the first centrifuge 10 for centrifugation. The first centrifuge 10 uses the two-phase washing waste liquid sent by the washing liquid recovery pipeline 9 to centrifugally separate the organic phase and the water phase at different rotational speeds, so that the water phase and the water phase are separated. The organic phase is separated; the separated organic phase enters the second centrifuge 11, and the second centrifuge 11 further separates and collects the unburned carbon particles and heavy oil in the flue gas adsorbed in the organic phase absorbent by using different rotational speeds In the VOCs/PM collection bin 15, the separated organic phase is transported to the washing liquid mixing tank 30 through the second organic phase recovery pipeline 21 for re-preparing the dual phase composed of the aqueous phase oxidant and the organic phase absorbent detergent;

3. The water phase obtained by separation enters the water phase storage tank 12, and the water phase in the water phase storage tank 12 is pumped to the concentration feedback controller 14 under the action of the first water phase circulation pump 13 to detect the effective components, so as to detect the effective components. Judging whether the water phase can meet the preparation requirements of the two-phase washing solution: the pH sensor 32 judges whether the water phase meets the preparation requirements of the two-phase washing solution by monitoring the pH value of the aqueous waste liquid, and transmits the detection results in the form of electronic signals Give the signal feedback control element 34, and the salinity sensor 33 judges again whether the water phase meets the preparation requirements of the two-phase washing liquid by monitoring the salinity of the waste water in the water phase, and transmits the detection result to the signal feedback control element in the form of an electronic signal 34; When the pH value and salinity of the aqueous phase waste liquid meet the requirements at the same time, the signal feedback control element 34 controls the second fluid outlet end of the electric three-way control valve 35 to open, so that the aqueous phase flows into the washing liquid mixing unit. If the pH value and/or salinity of the waste liquid do not meet the preparation requirements of the two-phase washing liquid, the signal feedback control element 34 controls the first fluid outlet end of the electric three-way control valve 35 to open, so that the water phase flows into the heater 16, After being heated by the heater 16, it is sent to the sedimentation tank 17 through the fourth water phase recovery pipeline 24, and in the sedimentation tank 17, sulfate and nitrate are separated, and then the sedimentation tank supernatant is extracted by the second water phase circulating pump 18 and sent to the sedimentation tank. Participate in the electrolysis reaction in the bipolar membrane electrolytic cell 25 of the NaClO supply unit, for regenerating the NaClO solution;

4. At the same time, the seawater desalination retentate produced by the seawater desalination device on the ship is passed into the bipolar membrane electrolytic cell 25 through the seawater desalination retentate liquid inlet pipeline 27, so that it is mixed with the supernatant extracted from the sedimentation tank 17, Thus, the desalination retentate can be diluted to reach the optimum electrolysis concentration, which is used for electrolysis to produce NaClO solution, and then the NaClO solution produced by electrolysis is stored in the NaClO storage tank 26 . The NaClO solution in the NaClO storage tank 26 is pumped to the washing liquid mixing tank 30 by the NaClO solution circulating pump 28 through the NaClO liquid outlet pipeline 29. The washing liquid circulating pump 31 is used to transport it to the washing tower 3 for participating in the desulfurization and denitration reaction, so as to realize the separation of waste in the washing liquid and the recycling of the washing liquid, and realize the continuous absorption of desulfurization and denitrification.

In this embodiment, by setting up a washing liquid recovery unit, multiple sets of centrifuges are used to separate the aqueous phase and the organic phase of the washing waste liquid after washing; through the concentration feedback controller, the aqueous phase that does not reach the concentration limit is reused, and the concentration limit will be reached. The water phase is heated and concentrated, and the sulfate and nitrate are separated in the sedimentation tank and continue to participate in the process of electrolytic regeneration of NaClO; the organic phase absorbent obtained by separation is further used to separate the unburned carbon particles and heavy oil in the flue gas by a centrifuge, and the remaining organic phase absorbent. The phase absorbent re-participates in the desulfurization and denitration reaction; through the above recycling process, the utilization rate of the aqueous oxidant and the organic phase absorbent is improved, the discharge of the organic phase absorbent is eliminated, and the environmental pollution caused by the washing waste liquid is reduced.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. However, the obvious changes or changes derived from this are still within the protection scope of the claims of this patent application.

Claims (10)

1. a marine wet flue gas combined desulfurization and denitrification integrated circulation system is characterized in that, comprising desulfurization and denitrification washing unit, washing liquid recovery unit, NaClO supply unit and washing liquid mixing unit; The washing liquid outlet of described desulfurization and denitration washing unit The end is in fluid communication with the washing liquid inlet end of the washing liquid recovery unit, the organic phase outlet end of the washing liquid recovery unit is in fluid communication with the organic phase inlet end of the washing liquid mixing unit, and the washing liquid recovery unit is in fluid communication. The outlet end of the direct circulating water phase is in fluid communication with the inlet end of the direct circulating water phase of the washing liquid mixing unit, and the outlet end of the indirect circulating water phase of the washing liquid recovery unit is in fluid communication with the indirect circulating water phase inlet of the NaClO supply unit. The NaClO solution outlet end of the NaClO supply unit is in fluid communication with the NaClO solution inlet end of the washing solution mixing unit, and the desulfurization and denitration washing solution outlet end of the washing solution mixing unit is in fluid communication with the desulfurization and denitration washing solution. The desulfurization and denitrification washing liquid inlet end of the unit is in fluid communication, and the supplementary brine inlet end of the NaClO supply unit is in fluid communication with the seawater desalination retentate liquid inlet pipe (27); the flue gas inlet end of the desulfurization and denitration washing unit is in fluid communication with the flue gas The gas inlet pipe (1) is in fluid communication, and the flue gas outlet end of the desulfurization and denitration washing unit is in fluid communication with the flue gas outlet pipe (7). 2. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 1, wherein the desulfurization and denitrification washing unit comprises a washing tower (3) and a cooler (2); the cooler (2) The flue gas outlet end of the cooler (2) is in fluid communication with the air inlet of the washing tower (3); the flue gas inlet end of the cooler (2) is in fluid communication with the flue gas intake pipe (1); The liquid outlet of the washing tower (3) is in fluid communication with the washing liquid inlet end of the washing liquid recovery unit through the washing liquid recovery pipeline (9), and the air outlet of the washing tower (3) is connected to the flue gas outlet. The pipeline (7) is in fluid communication, and the liquid inlet of the washing tower (3) is in fluid communication with the outlet end of the desulfurization and denitration washing liquid of the washing liquid mixing unit through the washing liquid inlet pipe (8). 3. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 2, wherein the washing tower (3) comprises a washing tower body, a washing liquid nozzle (4) and a stirring assembly (5); The washing liquid nozzle (4) is fixedly installed inside the washing tower body and adjacent to the liquid inlet, and the stirring assembly (5) is fixedly installed inside the washing tower body and adjacent to the liquid outlet, so The fluid inlet end of the washing liquid spray head (4) is in fluid communication with the washing liquid inlet pipe (8) through the liquid inlet, and the fluid outlet end of the washing liquid spray head (4) faces the stirring assembly ( 5); the liquid inlet and the air outlet are respectively arranged at the upper part of the side wall of the washing tower body, and the air inlet and the liquid outlet are respectively arranged at the lower part of the side wall of the washing tower body. 4. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 3, characterized in that, a mist eliminator (6) is fixedly installed at the gas outlet, and the flue gas flows freely along the inside of the washing tower body. After flowing through the mist eliminator (6) from bottom to top, it enters the flue gas outlet pipe (7) through the gas outlet; The stirring assembly (5) includes a motor, a rotating shaft and a helical blade; the motor is installed outside the washing tower body, the motor is drivingly connected with the first end of the rotating shaft, and the second end of the rotating shaft passes through The washing tower body extends into the washing tower body, and the spiral blade is fixedly installed on the second end of the rotating shaft. 5. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 3, wherein the horizontal distance between the liquid inlet and the air inlet is equal to the inner diameter of the washing tower body; the There are two or more groups of washing liquid nozzles (4), and the washing liquid nozzles (4) of two or more groups are distributed at equal intervals from top to bottom in the washing tower body; There are two or more spray heads (4), and the two or more than two washing liquid spray heads (4) are distributed at equal intervals on the same horizontal plane. 6. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 1, wherein the washing liquid recovery unit comprises a first centrifuge (10), a second centrifuge (11), a water phase Storage tank (12), concentration feedback controller (14), VOCs/PM collection bin (15), heater (16), sedimentation tank (17), first water phase circulation pump (13) and second water phase circulation pump (18); The organic phase outlet end of the first centrifuge (10) is in fluid communication with the fluid inlet end of the second centrifuge (11) through the first organic phase recovery pipeline (19), and the second centrifuge (11) ) of the first fluid outlet end is in fluid communication with the organic phase inlet end of the washing liquid mixing unit through the second organic phase recovery pipeline (21), and the second fluid outlet end of the second centrifuge (11) is connected to the The VOCs/PM collection bin (15) is fluidly connected; The water-phase outlet end of the first centrifuge (10) is in fluid communication with the fluid inlet end of the water-phase storage tank (12) through a first water-phase recovery pipeline (20), and the water-phase storage tank (12) ) fluid outlet end is in fluid communication with the fluid inlet end of the concentration feedback controller (14) through the first water phase circulating pump (13); the first fluid outlet end of the concentration feedback controller (14) It is in fluid communication with the fluid inlet end of the heater (16), and the fluid outlet end of the heater (16) is in fluid communication with the fluid inlet end of the settling tank (17) through the second water phase recovery pipe (22) Conduction, the fluid outlet end of the settling tank (17) sequentially passes through the second water phase circulating pump (18) and the fourth water phase recovery pipeline (24) and the indirect circulating water phase inlet end of the NaClO supply unit fluid conduction; the second fluid outlet end of the concentration feedback controller (14) is in fluid communication with the direct circulating water phase inlet end of the washing liquid mixing unit through a third water phase recovery pipeline (23); The inlet end of the washing liquid of the first centrifuge (10) is in fluid communication with the outlet end of the washing liquid of the desulfurization and denitration washing unit. 7. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 6, wherein the concentration feedback controller (14) comprises a concentration feedback pipeline, a pH sensor (32), a salinity sensor (33) ), a signal feedback control element (34) and an electric three-way control valve (35); the pH sensor (32) and the salinity sensor (33) are fixedly installed on the concentration feedback pipeline, and the electric three-way control valve (35) The fluid inlet end of the control valve (35) is in fluid communication with the fluid outlet end of the concentration feedback pipe; the first fluid outlet end of the electric three-way control valve (35) is in fluid communication with the fluid of the heater (16). The inlet end is fluidly connected, and the second fluid outlet end of the electric three-way control valve (35) is fluidly connected to the directly circulating water phase inlet end of the washing liquid mixing unit through the third water phase recovery pipeline (23). The detection end of the pH sensor (32) is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the pH sensor (32) is electrically connected to the pH signal input end of the signal feedback control element (34). connection; the detection end of the salinity sensor (33) is in contact with the fluid in the concentration feedback pipeline, and the signal output end of the salinity sensor (33) is in contact with the salinity signal of the signal feedback control element (34). The input end is electrically connected; the signal feedback control element (34) controls the fluid in the concentration feedback pipeline by controlling the opening and closing of the first fluid outlet end and the second fluid outlet end of the electric three-way control valve (35). Flow to the heater (16) or the washing liquid mixing unit; the fluid outlet end of the water phase storage tank (12) passes through the first water phase circulation pump (13) and the fluid inlet of the concentration feedback pipeline end fluid conduction. 8. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 1, wherein the NaClO supply unit comprises a bipolar membrane electrolytic cell (25), a NaClO storage tank (26) and a NaClO solution circulation Pump (28); the fluid outlet end of the bipolar membrane electrolytic cell (25) is in fluid communication with the fluid inlet end of the NaClO storage tank (26), and the NaClO solution outlet end of the NaClO storage tank (26) is in turn Through the NaClO liquid outlet pipe (29) and the NaClO solution circulation pump (28), it is in fluid communication with the NaClO solution inlet end of the washing liquid mixing unit; the supplementary brine inlet end of the bipolar membrane electrolysis cell (25) is connected to the The seawater desalination retentate liquid inlet pipe (27) is in fluid communication, and the indirect circulating water phase inlet end of the bipolar membrane electrolysis cell (25) is in fluid communication with the indirect circulating water phase outlet end of the washing liquid recovery unit. . 9. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 8, wherein the bipolar membrane electrolytic cell (25) comprises an electrolytic cell body, a first titanium mesh (36), a second A titanium mesh (37) and an ion exchange membrane (38); the ion exchange membrane (38) divides the electrolytic cell body into two spaces, the first titanium mesh (36) and the second titanium mesh (37) ) are respectively located in two spaces, the first titanium mesh (36) is electrically connected with the positive pole of the DC power supply, and the second titanium mesh (37) is electrically connected with the negative pole of the DC power supply; the side walls of the electrolytic cell body are respectively A first liquid inlet, a second liquid inlet and a liquid outlet are provided; the indirect circulating water phase outlet end of the washing liquid recovery unit is in fluid communication with the electrolytic cell body through the first liquid inlet, so The seawater desalination retentate liquid inlet pipeline (27) is in fluid communication with the electrolytic cell body through the second liquid inlet, and the electrolytic cell body is in fluid communication with the NaClO storage tank (26) through the liquid outlet on. 10. The marine wet flue gas combined desulfurization and denitrification integrated circulation system according to claim 1, characterized in that, the washing liquid mixing unit comprises a washing liquid mixing tank (30) and a washing liquid circulating pump (31); the The desulfurization and denitration washing liquid outlet end of the washing liquid mixing tank (30) is in fluid communication with the desulfurization and denitration washing liquid inlet end of the desulfurization and denitration washing unit through the washing liquid circulating pump (31); the washing liquid mixing tank (30) ) of the direct circulating water phase inlet end is in fluid communication with the direct circulating water phase outlet end of the washing liquid recovery unit, and the organic phase inlet end of the washing liquid mixing tank (30) is in fluid communication with the organic phase of the washing liquid recovery unit. The outlet end is in fluid communication, and the NaClO solution inlet end of the washing liquid mixing tank (30) is in fluid communication with the NaClO solution outlet end of the NaClO supply unit.

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