CN107694266A - A kind of ship tail gas combined desulfurization removes particle device - Google Patents

Abstract

A combined desulfurization and particle removal device for ship tail gas, comprising a cyclone dust collector composed of an tail gas inlet pipe, an outer cylinder, an inner cylinder, a cone cylinder, and an ash collecting hopper, and a first insulation is arranged on the inner wall of the outer cylinder of the cyclone dust collector layer, the outer wall of the inner cylinder of the cyclone dust collector is provided with a second insulating layer, the discharge electrode is arranged on the second insulating layer, the dust collecting electrode is arranged on the first insulating layer, the insulating layer and the acoustic wave generator; provided by the invention The ship tail gas cyclone type desulfurization and particle removal compound device can effectively reduce the discharge of harmful pollutants in the ship tail gas by washing and removing the particles and SO2 in the tail gas. Save the limited space on the ship, the pressure drop of this device is small, it can adapt to various environments, and the removal efficiency of pollutants is high, especially for small particle size particles.

Description

A combined desulfurization and particle removal device for ship tail gas

technical field

_The invention belongs to a ship engine tail gas treatment device, in particular to a composite device for jointly absorbing and removing particulate matter and SO2 in the ship engine tail gas.

Background technique

For a long time, the shipping industry has been environmentally friendly. However, in recent decades, with the increasingly serious problems of resource shortage and environmental pollution, marine diesel engines, as the main source of ocean and port air pollution, have attracted widespread attention from governments and regions. In order to protect the atmospheric environment of oceans and ports and effectively control the emission of harmful gases, organizations such as the International Maritime Organization (IMO) and governments of various countries have issued pollutant limit regulations and set up emission control areas. Among them, IMO's "International Convention for the Prevention of Pollution from Ships" Annex VI "Rules for the Prevention of Air Pollution from Ships" clearly stipulates the limits of pollutant discharge from ships.

During the combustion of fossil fuels, a large amount of pollutants such as SOx and particulate matter will be produced. SO2 is one of the main air pollutants faced by human beings today. In the process of breathing, it carries toxic substances into the human body and increases the incidence of illness. At present, the energy saving and emission reduction of ships has become a hot spot in the international community.

In order to protect the deteriorating ecological environment, it is very important to reduce smog and reduce SO2 and particulate matter emissions in ship exhaust.

Contents of the invention

The purpose of the present invention is to provide a combined desulfurization and particle removal device for ship tail gas that can simultaneously remove SO2 and particulate matter in ship tail gas, especially for tiny particles with a particle size of less than 2.5 μm.

The object of the present invention is achieved like this: comprise the cyclone dust collector that is made of tail gas inlet pipe, outer cylinder, inner cylinder body, cone cylinder and ash-collecting hopper, first insulating layer is set on the inner wall of the outer cylinder of cyclone dust collector , the outer wall of the inner cylinder of the cyclone dust collector is provided with a second insulating layer, the discharge electrode is arranged on the second insulating layer, the dust collecting electrode is arranged on the first insulating layer, the insulating layer and the sound wave generator, and the insulating layer is uniform The discharge electrode is installed on the insulating layer of the inner cylinder, the dust collecting electrode is installed on the insulating layer of the outer cylinder, and is installed on the top of the outer cylinder of the cyclone dust collector. sound generator.

The present invention also includes such structural features:

1. An absorption liquid nozzle is provided on the cone, and a demister is also included, and the demister is installed inside the inner cylinder.

2. It also includes deflectors, and the deflectors are installed on the inner side of the outer cylinder, the outer side of the inner cylinder and the bottom of the cone respectively.

3. Multiple absorption liquid nozzles are evenly spaced on the cone, and multiple absorption liquid nozzles share a ring-shaped absorption liquid supply pipe.

4. Set a dust-proof ring in the inner cylinder.

Disclosed is a composite device for desulfurization and particle removal of ship exhaust cyclone. The device includes: exhaust gas inlet pipe, clean gas outlet pipe, outer cylinder, inner cylinder, cone, discharge electrode, dust collecting electrode, sound wave generator, deflector, absorption liquid nozzle, annular absorption liquid supply pipe , Absorbing liquid inlet, dust collecting hopper, drain valve, mist eliminator, insulation layer. The inner cylinder is located inside the outer cylinder, and the tail gas inlet pipe is connected to the top of the outer cylinder along the tangential direction, and communicates with the cavity between the inner and outer cylinders; the clean gas outlet is respectively connected to the external induced draft fan and the inner cylinder; the outer cylinder The inner side and the outer side of the inner cylinder are evenly distributed with an insulating layer. The discharge electrode is installed on the inner cylinder insulation layer. The discharge electrode is a negative electrode and is wound into a coil by a metal wire; The positive electrode is made of a metal plate with a certain geometric shape; the top of the outer cylinder is equipped with a sound wave generator, which can generate sound waves to clean the dust collecting electrode; the ring-shaped absorption liquid supply pipe is fixed on the upper part of the desulfurization cone by a bracket, and the ring Absorption liquid nozzles are evenly arranged on the circular absorption liquid supply pipe, the nozzles are installed on the wall of the outer cylinder, and the nozzles extend into the cylinder; the absorption liquid inlet is arranged on the ring-shaped absorption liquid supply pipe, and the absorption liquid pump is externally connected. The demister is installed inside the inner cylinder; the cone is connected to the outer cylinder, and the bottom is provided with a deflector. The ash collecting hopper is located at the bottom of the device and connected to the cone. The bottom of the ash collecting hopper is provided with a drain valve. Wash wastewater containing particulate matter is discharged through the discharge valve into an external settling tank. When the ship's exhaust gas enters the device through the exhaust gas inlet, a swirling flow is formed under the action of the inlet pipe and the deflector. The particulate matter in the exhaust gas is relatively large in mass, and is separated from the exhaust swirling flow under the action of centrifugal force, while the smaller particles Under the action of the electrostatic field, the dust collecting electrode is enriched, and under the action of the centrifugal force and the electrostatic field, the particles are basically removed. Then in the cone area, the air flow is washed by the alkaline absorption liquid sprayed from the absorption liquid nozzle to wash off the SO2 in the tail gas, and the purified tail gas passes through the demister and is discharged from the device through the clean gas outlet.

The pH of the desulfurization absorption liquid in the composite device for cyclone desulfurization and particle removal of ship tail gas is controlled at 6.5-8.0.

The absorption liquid in the composite device for cyclone desulfurization and particulate removal of ship tail gas is NaOH or other alkaline solutions.

Compared with prior art, the beneficial effect of the present invention is:

( ₁ ) The present invention simultaneously realizes the removal of particulate matter and SO2 in ship exhaust in a composite device, which improves compactness and saves space.

(2) The device removes the particulate matter in the ship exhaust gas through the combination of cyclone and static electricity, and has a good removal effect on fine particles with small particle size, which makes up for the small particle size particles caused by the simple use of cyclone dust removal The disadvantage of poor removal effect.

(3) The device generates sound waves through the sound wave generator to clean the dust collecting electrodes in the device. The sound waves generated by the sound wave generator can effectively remove the fine particles on the dust collecting electrodes and make them fall into the dust collecting hopper to collect.

(4) The device removes particulate matter in the first half, effectively avoiding the impact of particulate matter on the desulfurization effect. The lower part of the cone body is equipped with an annular absorption liquid supply pipe, on which the absorption liquid nozzles are evenly distributed, and the waste gas from which particulate matter has been removed passes through the cone part for alkaline washing and desulfurization.

(5) The inner cylinder is equipped with a demister. In the process of demisting the cleaned air after washing, it can further remove trace particles that have not been removed to ensure the removal efficiency of pollutants.

The present invention relates to chemical equations as:

2NaOH+SO ₂ →Na ₂ SO ₃ +H ₂ O

_The ship tail gas cyclone type desulfurization and particle removal composite device provided by the invention can effectively absorb SO2 and particles in the tail gas. The structure of the device is compact, and the economy is greatly improved. While removing SO ₂ , it can completely remove particles, especially particles with small particle sizes.

Description of drawings

Figure 1 is a schematic diagram of a ship tail gas cyclone desulfurization and particle removal device.

Fig. 2 is a schematic diagram of Fig. 1A-A direction.

Fig. 3 is a schematic diagram of Fig. 1B-B direction.

detailed description

The following examples describe the present invention in more detail.

The reference signs in the figure respectively represent: 1 is the exhaust gas inlet pipe, 2 is the outer cylinder, 3 is the inner cylinder, 4 is the cone cylinder, 5 is the discharge electrode, 6 is the ash collecting electrode, 7 is the acoustic wave generator, 8 is the second One deflector, 9 is the second deflector, 10 is the third deflector, 11 is the absorption liquid nozzle, 12 is the annular absorption liquid supply pipe, 13 is the absorption liquid inlet, 14 is the ash collecting bucket, 15 is a drain valve, 16 is a mist eliminator, 17 is a first insulating layer, 18 is a dust trap, 19 is a net gas outlet, 20 is a bracket, and 21 is a second insulating layer.

The exhaust gas of the marine engine is connected to the exhaust gas inlet pipe 1, and the exhaust gas inlet pipe 1 is connected to the top of the outer cylinder 2 along the tangential direction, and communicates with the cavity between the inner and outer cylinders. The device from outside to inside is: outer cylinder 2 ; second insulating layer 21 ; ash collecting electrode 6 ; discharge electrode 5 ; first insulating layer 17 ; The upper end of the inner cylinder body 3 is connected with the clean gas outlet 19 . The lower part of the outer cylinder body 2 is connected with the cone cylinder 4 .

The insulating layer is evenly distributed on the inner side of the outer cylinder 2 and the outer side of the inner cylinder 3 . The discharge electrode 5 is installed on the first insulating layer 17, and the discharge electrode is a negative electrode, which is made of metal wires with different cross-sectional shapes; the ash collecting electrode 6 is installed on the second insulating layer 21, and the ash collecting electrode is a positive electrode, which is made of metal wires with different geometric shapes. board made. The inner side of the outer cylinder 2 is provided with a first deflector 8; the outer side of the inner cylinder 3 is provided with a second deflector 9; through the first deflector 9 and the second deflector 10, the exhaust gas can be guided into the inner space of the cylinder The final flow makes it generate swirling flow to achieve the purpose of removing large-size particles.

The acoustic wave generator 7 is installed on the top of the outer cylinder 2. When the fine particles are enriched at the ash collecting electrode 6 under the action of the electrostatic field, the acoustic wave generator 7 can generate sound waves to clean the ash collecting electrode 6.

The annular absorption liquid supply pipe 12 is fixed on the upper part of the cone cylinder 4 by the bracket 20, and the annular absorption liquid supply pipe 12 is evenly installed with the absorption liquid nozzle 11 in the circumferential direction, as shown in Figure 3, the nozzle is installed on the outer cylinder wall, and the nozzle extends into the cylinder ; The absorption liquid inlet 13 is arranged on the outside of the annular absorption liquid supply pipe 12, and is externally connected to the absorption liquid pump.

The mist eliminator 16 is installed inside the inner cylinder 3, and when the swirling air passes through the dust removal and desulfurization operations and rotates into the inner cylinder 3, the mist eliminator 16 performs the demisting operation. The bottom of the inner cylinder is provided with a dust-proof ring 18, which can effectively block the fine particles that have not been removed completely.

The bottom of the cone cylinder 4 is provided with a third deflector deflector 10, which guides the swirling air flow. The ash collecting hopper 14 is located at the bottom of the device and is connected to the lower end of the cone 4. The bottom of the ash collecting hopper 14 is provided with a drain valve 15 through which the washing wastewater containing particles is discharged into an external sedimentation tank for further processing.

The ship tail gas cyclone type desulfurization and particle removal _compound device provided by the invention can effectively reduce the emission of harmful pollutants in the ship tail gas by washing and removing the particles and SO ₂ in the tail gas. Operation, and at the same time can greatly save the limited space on the ship, the pressure drop of this device is small, it can adapt to various environments, and the removal efficiency of pollutants is high, especially for small particle size particles.

Although the invention has been described herein in connection with the examples, it is to be understood that the invention is not limited to the disclosed embodiments but encompasses various combinations or combinations of features thereof as defined in the appended claims. Modifying some other applications is already included within the scope of the invention.

Claims (7)

1. a kind of ship tail gas combined desulfurization removes particle device, including by gas inlet pipe, outer barrel, inner barrel, cone cylinder and collection ash Struggle against the cyclone dust collectors formed, it is characterised in that the first insulating barrier is set on the inwall of the outer barrel of cyclone dust collectors, whirlwind removes Second insulating barrier is set on the outer wall of the inner barrel of dirt device, sparking electrode is set over the second dielectric, on the first insulating barrier Set and collect grey electrode, insulating barrier and sonic generator, the insulating barrier is evenly distributed in inner side and the inner barrel of outer cylinder body Outside, the sparking electrode are arranged on inner barrel insulating barrier, and the grey electrode of collection is arranged on outer cylinder body insulating barrier, in whirlwind Installation sonic generator at the top of the outer cylinder body of deduster.

2. ship tail gas combined desulfurization according to claim 1 removes particle device, it is characterised in that sets and inhales in cone cylinder Nozzle for liquid, in addition to demister are received, the demister is arranged on the inside of inner barrel.

3. ship tail gas combined desulfurization according to claim 1 or 2 removes particle device, it is characterised in that also including water conservancy diversion Plate, described deflector are separately mounted to the bottom of outer cylinder body inner side, inner barrel outside and cone cylinder.

4. ship tail gas combined desulfurization according to claim 2 removes particle device, it is characterised in that multiple absorption nozzle for liquid The uniform equidistantly distributed in cone cylinder, multiple absorption nozzle for liquid share an annular absorbing liquid supply pipe.

5. ship tail gas combined desulfurization according to claim 1 or 2 removes particle device, it is characterised in that in inner barrel Resistance konisphere is set.

6. ship tail gas combined desulfurization according to claim 3 removes particle device, it is characterised in that is set in inner barrel Hinder konisphere.

7. ship tail gas combined desulfurization according to claim 4 removes particle device, it is characterised in that is set in inner barrel Hinder konisphere.