CN206668363U - A kind of natural gas engine tail gas Integrated Processing Unit peculiar to vessel - Google Patents

Abstract

The purpose of this utility model is to provide a kind of natural gas engine tail gas Integrated Processing Unit peculiar to vessel, including post-processing casing, nitrogen separation device, the bottom of casing is post-processed filled with absorbing liquid, primary granule absorbed layer, heat reclamation device, filter layer and electric flase floor are respectively positioned on liquid level, the import of the offgas duct connection primary granule absorbed layer of engine, the air inlet pipe of the outlet connection heat reclamation device of primary granule absorbed layer, the escape pipe of heat reclamation device is located at below absorbing liquid liquid level, tapering type tail gas after-treatment enlarging is set on absorbing liquid liquid level, tail gas after-treatment enlarging is sequentially arranged above filter layer, electric flase floor, drying layer is simultaneously sequentially connected logical, drying layer connects the entrance of nitrogen separation device, the outlet outlet of nitrogen separation device.The utility model takes the mode such as graviational interaction between positive negative electricity flase floor, completes the high level absorption processing of particle, while improves fuel utilization efficiency.

Description

A comprehensive treatment device for marine natural gas engine tail gas

technical field

The utility model relates to a natural gas engine, in particular to an exhaust gas treatment device of the natural gas engine.

Background technique

According to statistics, about 50% of the smog and dust particles come from marine internal combustion engines. At this stage, natural gas is gradually being valued as a promising alternative energy source. As an emerging clean alternative energy source, natural gas has greatly improved compared with diesel engine exhaust. At this stage, the treatment of tail gas includes the absorption and utilization of particles and harmful gases. Due to its composition, the combustion of natural gas produces more particles, which are more likely to block the interface in the engine.

The existing natural gas engine exhaust gas treatment system cannot effectively remove fine particles, which affects work.

Contents of the invention

The purpose of the utility model is to provide a marine natural gas engine tail gas comprehensive treatment device for effectively absorbing particle pollutants.

The purpose of this utility model is achieved in that:

The utility model is a marine natural gas engine tail gas comprehensive treatment device, which is characterized in that it includes a post-processing box, a nitrogen separation device, and a primary particle absorption layer arranged in the post-processing box, a heat recovery device, a filter layer and an electric grid plate, the bottom of the post-treatment box is filled with absorption liquid, the primary particle absorption layer, heat recovery device, filter layer and electric grid plate are all located above the liquid surface, the exhaust pipe of the engine is connected to the inlet of the primary particle absorption layer, and the primary particle The outlet of the absorbing layer is connected to the inlet pipe of the heat recovery device. The outlet pipe of the heat recovery device is located below the liquid level of the absorption liquid, and a tapered tail gas secondary treatment flare is set above the liquid surface of the absorption liquid, above the tail gas secondary treatment flare. A filter layer, an electric grid plate, and a drying layer are sequentially arranged and connected in sequence, the drying layer is connected to the inlet of the nitrogen separation device, and the outlet of the nitrogen separation device is connected to the outlet pipe.

The utility model can also include:

1. The heat recovery device includes a heat recovery device compartment, a cooling water channel is arranged in the heat recovery device compartment, and a recovery heat output pipeline is arranged at the lower part of the heat recovery device compartment.

2. The filter layer includes a coarse filter layer and a fine filter layer. The coarse filter layer is located below the fine filter layer and first contacts the exhaust gas from the secondary treatment of the exhaust gas; the steel wire mesh in the coarse filter layer is 2.5 μm, and the fine filter layer is The fiber woven layer in the filter layer is 2.5 μm-10 μm.

3. The electric grid plate includes a positive electric grid plate and a negative electric grid plate. The positive electric grid plate is located under the negative electric grid plate and first contacts the exhaust gas from the drying layer.

The utility model has the advantages that: the utility model adopts the gravitational action between the positive and negative electric grid plates to complete the high-level absorption treatment of the particles and improve the fuel utilization efficiency at the same time.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

The utility model is described in more detail below in conjunction with accompanying drawing example:

With reference to Fig. 1, the utility model includes particle filter layers 2, 11, 12, heat recovery device, drying layer 17, positive and negative grid plates 14, 15, absorption liquid 8 and the like. The gas passes through the absorption liquid 8 and filter layers 2, 11, 12 for particle absorption, heat recovery device for waste heat utilization, molecular sieve for separation and recovery of N2 by using different molecular passing speeds, and remaining gas HC and CO for combustion and reuse.

It can be seen from Fig. 1 that the utility model mainly includes that the exhaust gas inlet pipe 1 is connected with the primary particle absorption layer 2, the outlet of the primary particle absorption layer 2 is connected with the intake pipe of the heat recovery device, and is fixed by the intake pipe fixing clip 3, The heat recovery device includes a heat recovery device compartment 4, a cooling water channel 5 is set in the heat recovery device compartment 4, and a recovery heat output pipeline 6 is set at the lower part of the heat recovery device compartment 4, and the absorbed heat is transported through the recovery heat output pipeline 6 . The tail gas coming out of the outlet pipe 7 of the heat recovery device is discharged through the absorption liquid 8 and then enters through the tail gas secondary treatment flare 10, 14 and 15 positive and negative grid plates, passes through the drying layer 17, and passes through the nitrogen gas separation device 18 for N2 Recovery, the remaining available gases HC and CO enter the engine cylinder through the outlet pipe 19.

The working principle of the utility model is that the exhaust gas produced after combustion in the cylinder will enter the pipe 1 through the exhaust gas, and the particles will be primary absorbed through the coarse filter layer and the fine filter layer of the primary filter layer 2, and the primary recovery is mainly for larger particles, which is easy Build up in the ducts, blocking the airways. Enter the absorption liquid 8, absorb part of the water-soluble particles, and then pass through the coarse and fine filter layers 11 and 12 to effectively absorb the particles, the size of which reaches 10 microns, and the sodium hydroxide in the flare 10 is used to remove carbon dioxide through the tail gas secondary treatment, Through the positive and negative electric grid plates 14 and 15, the positive and negative phase suction can absorb smaller particles, and then dry them through the drying layer 17. At this time, the main components are compounds such as N2, HC and CO. At the same time, for the main gas As for the component N2, different molecules pass through the molecular sieve at different speeds to recover N2, and the remaining gas enters the engine cylinder through the gas outlet pipe 19 again. In this way, the exhaust gas is effectively purified, the waste heat is utilized, and the available components HC and CO are returned to the cylinder for utilization.

Claims (5)

1. A marine natural gas engine tail gas comprehensive treatment device is characterized in that it includes an aftertreatment box, a nitrogen separation device and a primary particle absorption layer, a heat recovery device, a filter layer and an electric grid plate arranged in the aftertreatment box , the bottom of the post-treatment box is filled with absorption liquid, the primary particle absorption layer, heat recovery device, filter layer and electric grille are all located above the liquid level, the exhaust pipe of the engine is connected to the inlet of the primary particle absorption layer, and the primary particle absorption layer The outlet of the layer is connected to the inlet pipe of the heat recovery device. The outlet pipe of the heat recovery device is located below the liquid level of the absorption liquid, and a tapered tail gas secondary treatment flare is set above the liquid surface of the absorption liquid. A filter layer, an electric grid plate, and a drying layer are arranged and connected in sequence, the drying layer is connected to the inlet of the nitrogen separation device, and the outlet of the nitrogen separation device is connected to the outlet pipe. 2. A comprehensive exhaust gas treatment device for marine natural gas engines according to claim 1, characterized in that: the heat recovery device includes a heat recovery device interlayer, a cooling water channel is arranged in the heat recovery device interlayer, and the heat recovery device The lower part of the interlayer is provided with a recovery heat output pipe. 3. A marine natural gas engine tail gas comprehensive treatment device according to claim 1 or 2, characterized in that: the filter layer includes a coarse filter layer and a fine filter layer, the coarse filter layer is located below the fine filter layer and first contacts Exhaust gas from the secondary treatment of exhaust gas; the steel wire mesh in the coarse filter layer is 2.5 μm, and the fiber woven layer in the fine filter layer is 2.5 μm-10 μm. 4. A marine natural gas engine tail gas comprehensive treatment device according to claim 1 or 2, characterized in that: the electric grid plate includes a positive electric grid plate and a negative electric grid plate, and the positive electric grid plate is located at Below the negative grid plate and first contact the exhaust gas from the drying layer. 5. A marine natural gas engine tail gas comprehensive treatment device according to claim 3, characterized in that: the electric grid plate includes a positive electric grid plate and a negative electric grid plate, and the positive electric grid plate is located in the negative electric grid Below the grid plate and first contact the exhaust gas from the drying layer.