KR102076915B1 - Fluidized Catalystic Response System with Regeneration Function - Google Patents

Abstract

The present invention relates to a fluidized-bed catalytic reaction system which reduces nitrogen oxides (NOx) and sulfur oxides (SOx), harmful substances contained in exhaust emissions of a ship, by a catalytic reaction. In particular, the system is configured to collect catalyst particles onto which sulfur oxides (SOx) are adsorbed, and regenerate and reuse the same by releasing the sulfur oxides (SOx). To achieve the above object, the fluidized-bed catalytic reaction system, which uses catalyst particles to reduce hazardous substances from exhaust emissions generated in an engine of a ship, comprises: a reaction tank which catalyst particles are located in and reduces hazardous substances contained in exhaust gas introduced thereinto by catalytic reaction or adsorption; a regeneration tank which collects the catalyst particles from among the exhaust gas and the catalyst particles discharged from the reaction tank and performs regeneration by removing the hazardous substances adsorbed; and a recovery supply pipe which connects the regeneration tank and the reaction tank to supply regenerated catalyst particles to the reaction tank.

Description

Fluidized Catalytic Response System with Regeneration Function

The present invention relates to a fluidized bed catalytic reaction system for reducing nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful substances contained in the exhaust gas of a ship, by catalytic reaction. After collection, the sulfur oxide (SOx) is separated and regenerated and then reused as a catalyst particle for removing nitrogen oxide (NOx).

Due to the rapid industrialization of modern society, the consumption of fossil fuels has increased, and air pollution due to harmful substances generated in the combustion process is serious.

The main causes of air pollution are nitrogen oxides (NOx), sulfur oxides (SOx), and fine dust (PM).

As awareness of environmental preservation increases, emission regulations for exhaust gases are strictly enforced. In particular, in the field of ships, the International Maritime Organization (IMO), a subsidiary of the United Nations, regulates the emission of NOx and SOx contained in exhaust gases emitted from ships.

SCR (SELECTIVE CATALYTIC REDUCTION) is a technology for removing NOx from ship's exhaust gas. SCR is a technology that converts NOx into nitrogen and water by injecting ammonia or urea into the catalyst.

Techniques for removing SOx from ships are divided into wet and dry, where wet is to remove sulfur oxides with seawater or alkaline solutions, and dry is to remove sulfur oxides using calcium hydroxide or sodium-based absorbents.

These NOx and SOx removal technologies are separate, and it was difficult to apply the removal technology to ships continuously.

Even if individual NOx and SOx removal technologies are applied to a ship, a considerable installation space is required to build a NOx removal device and a SOx removal device in a ship, and thus the space utilization inside the ship is lowered. There is this.

In addition, the conventional catalyst cannot be regenerated during the removal of NOx and SOx, so that a catalyst regeneration system must be provided separately, and a cleaning operation must be performed through the catalyst regeneration system for regeneration of the catalyst at any time.

As such, in the related art, as the regeneration of the catalyst is additionally performed, there is a disadvantage in that the reduction system of NOx and SOx should be operated intermittently.

Republic of Korea Patent Application Publication No. 2000-0017881 (published 2000.04.06) Republic of Korea Patent Publication No. 10-2017-0080771 (Published Date 2017.07.11)

The present invention has been invented to solve the problems of the prior art as described above, after collecting and regenerating the catalyst particles for reducing nitrogen oxides (NOx) and sulfur oxides (SOx) contained in the exhaust gas of the ship It is an object of the present invention to provide a fluidized bed catalytic reaction system configured to continuously remove or reduce harmful substances contained in exhaust gas by supplying the reaction vessel.

The present invention for achieving the above object is a fluidized bed catalytic reaction system using catalyst particles to reduce harmful substances in the exhaust gas generated from the engine of the ship, the catalyst particles are located inside and included in the exhaust gas introduced into the interior Supplying the reaction vessel to reduce the harmful substances by the catalytic reaction or adsorption, the regeneration tank to collect and regenerate the harmful substances adsorbed by trapping the catalyst particles from the exhaust gas and catalyst particles discharged from the reaction tank, and supply the regenerated catalyst particles to the reaction tank Technical features are characterized in that it comprises a recovery supply pipe connecting the regeneration tank and the reaction tank.

In addition, according to a preferred embodiment of the present invention, the reaction tank, the exhaust gas inlet formed in the lower portion of the reaction vessel so that the exhaust gas generated in the engine, and located inside the reaction vessel, the catalyst particles are seated in the upper portion and the exhaust flowed into the lower portion A porous plate having a hole formed to allow gas to flow upward, a reducing agent supply line connected to the reaction vessel to supply a reducing agent to the catalyst particles located inside the reaction vessel, a recovery supply pipe connected to the regeneration tank so that the catalyst particles regenerated in the regeneration tank are supplied; It includes an exhaust gas outlet through which the exhaust gas is removed from the reaction tank is discharged, the reducing agent supply line and the recovery supply pipe is connected to the upper portion of the porous plate fixed inside the reactor.

In addition, according to a preferred embodiment of the present invention, the regeneration tank is a porous plate for dividing the interior into the upper zone and the lower zone, and the agent for connecting the reaction tank and the regeneration tank so that the exhaust gas discharged from the reaction tank to one side of the upper zone A first exhaust pipe, a second exhaust pipe connected to the other side of the upper zone to discharge the exhaust gas introduced into the upper zone through the first exhaust pipe, a reducing agent supply line connected to the regeneration tank to supply a reducing agent into the lower zone, and catalyst particles It includes a drain pipe for discharging the by-product generated by the removal of sulfur dioxide, the recovery supply pipe is connected to the bottom of the regeneration tank.

Further, according to a preferred embodiment of the present invention, the second exhaust pipe, the reducing agent supply line and the drain pipe are equipped with a filtration filter to block the passage of the catalyst particles.

In addition, according to a preferred embodiment of the present invention, an inert gas supply line for supplying an inert gas is connected to the reducing agent supply line so that the reducing agent and the inert gas are introduced into the lower section of the regeneration tank.

In addition, according to a preferred embodiment of the present invention, the first exhaust pipe, the reducing agent supply line and the recovery supply pipe connected to the regeneration tank is equipped with a valve to adjust the flow rate.

In addition, according to a preferred embodiment of the present invention, the volume ratio of reducing agent to inert gas in the reducing agent and inert gas entering the lower zone of the regeneration tank is 3-5% to 95-97%.

As described above, the fluidized bed catalytic reaction system having a regeneration function according to the present invention collects and regenerates catalyst particles scattered together with the exhaust gas, and supplies them back to the reactor, thereby providing nitrogen oxides (NOx) included in the exhaust gas and The advantage is that sulfur oxides (SOx) can be removed continuously.

In addition, the fluidized bed catalyst reaction system having a regeneration function according to the present invention does not need a separate device for regenerating the catalyst particles by the catalyst particles are collected in the regeneration tank by gravity, thereby reducing the volume of the fluidized bed catalyst reaction system to reduce the space utilization in the vessel In addition, there is an advantage that the facility cost is low by regenerating the catalyst by extending the reducing agent supply line used in the reaction tank to the regeneration tank.

1 is a conceptual diagram showing a fluidized bed catalytic reaction system having a regeneration function according to the present invention,
It is a conceptual diagram which shows the regeneration tank shown in FIG.

Hereinafter, a preferred embodiment of a fluidized bed catalytic reaction system having a regeneration function according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing a fluidized bed catalytic reaction system having a regeneration function according to the present invention, a conceptual diagram showing a regeneration tank shown in FIG.

As shown in FIG. 1, the fluidized bed catalytic reaction system having a regeneration function includes a reaction tank 100 for catalytically removing or reducing nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful substances contained in exhaust gas, by catalytic reaction. And a regeneration tank 140 which collects and regenerates the catalyst particles 110 flowing together with the exhaust gas discharged from the reaction tank 100, wherein the catalyst particles 110 regenerated in the regeneration tank 140 are the reaction tank 100. Recovery supply pipe 170 for connecting the regeneration tank 140 and the reaction tank 100 is formed to be introduced into.

Hereinafter, a fluidized bed catalytic reaction system having a regeneration function configured as described above will be described in more detail.

As shown in FIG. 1, an exhaust gas inlet 101 through which an exhaust gas generated from an engine is introduced is formed at a lower end of the reaction tank 100, and catalyst particles 110 are seated inside the reaction tank 100, and downwards. The porous plate 103 through which the introduced exhaust gas passes upward is fixed.

A reducing agent supply line 120 is connected to the side of the reactor 100 to supply ammonia, which is a reducing agent, to the inside of the reactor 100.

Nitrogen oxides (NOx) and sulfur oxides (SOx), which are harmful substances contained in the exhaust gas, are removed by the catalytic reaction generated inside the reaction tank 100, and the exhaust gas outlet 105 formed on the upper portion of the reaction tank 100 is removed. Exhaust through.

Meanwhile, the first exhaust pipe 107 extending from the exhaust gas outlet 105 of the reaction tank 100 extends to the regeneration tank 140, and the catalyst particles 110 flowing together with the exhaust gas are the first exhaust pipe 107. It is introduced into the regeneration tank 140 through.

As shown in FIG. 2, the regeneration tank 140 has a porous plate 143 partitioned into an upper portion and a lower portion thereof, and has a first exhaust pipe (1) at one side of the upper region 141H partitioned by the porous plate 143. 107 is connected and a second exhaust pipe 145 is connected to the other side of the upper region 141H to exhaust the exhaust gas into the atmosphere.

Here, the filtration filter 147 is mounted on the other side of the upper region 141H of the regeneration tank 140 to which the second exhaust pipe 145 is connected, so that the catalyst particles 110 included in the exhaust gas may move the second exhaust pipe 145. To prevent exhaustion into the atmosphere.

A reducing agent supply line 120 is connected to one side of the lower section 141L partitioned by the porous plate 143 fixed inside the regeneration tank 140, and supplies ammonia as a reducing agent into the lower section 141L. do.

A drain pipe 149 is connected to the other side of the lower zone 141L, and SO ₂ generated in the lower zone 141L is collected into the storage tank 150 through the drain pipe 149. Here, one side of the lower section 141L of the regeneration tank 140 to which the reducing agent supply line 120 is connected and the other side of the lower section 141L to which the drain pipe 149 is connected are equipped with a filtration filter 147 to reduce the supply line of the reducing agent 120. Ammonia is supplied through the filtration filter 147 to the lower region 141L of the regeneration tank 140, but the catalyst particles 110 inside the regeneration tank 140 to the reducing agent supply line 120. The filter unit 147 mounted on the other side of the lower section of the regeneration tank 140 also blocks the catalyst particles from flowing inside the regeneration tank 140 to the storage tank 150 through the drain pipe 149. Only the generated SO ₂ can be drained to the storage tank 150.

As shown in FIG. 2, the reducing agent supply line 120 extended to the regeneration tank 140 to supply an inert gas in addition to supplying ammonia as a reducing agent to the lower region 141L of the regeneration tank 140 is provided. An inert gas supply line 130 is connected, and supplies an inert gas stored in the inert gas storage tank 131 to the regeneration tank 140 together with ammonia as a reducing agent.

Meanwhile, the catalyst particles 110 regenerated in the lower region 141L are supplied to the upper portion of the porous plate 103 of the reactor 100 through the recovery supply pipe 170.

In the fluidized bed catalytic reaction system configured as described above, as shown in FIG. 1, a valve V is mounted on the reducing agent supply line 120, the first exhaust pipe 107, and the recovery supply pipe 170 to adjust the flow rate.

Hereinafter, the reaction relationship of the fluidized bed catalytic reaction system configured as described above will be described.

The catalyst particles 110 seated on the porous plate 103 in the reaction tank 100 react with ammonia, which is a reducing agent supplied through the reducing agent supply line 120, to perform a catalytic reaction for reducing NOx in exhaust gas to nitrogen. In addition, SOx contained in the exhaust gas is adsorbed to the catalyst particles 110 to have a function of removing SOx contained in the exhaust gas.

Here, catalysts such as renewable V ₂ O ₅ / AC, CuO / AC, CuO / Al ₂ O _3, and the like in a fluidized bed catalytic reaction system having a regeneration function according to the present invention are used.

The catalyst particles 110 used in the reactor 100 flow to the regeneration tank 140 along the first exhaust pipe 107 together with the exhaust gas from which NOx and SOx are removed.

In the exhaust gas introduced into the upper region 141H of the regeneration tank 140 along with the first exhaust pipe 107 and the used catalyst particles 110, the exhaust gas is located at the other side of the upper region 141H. While passing through 147 to the second exhaust pipe 145 in the atmosphere, the catalyst particles 110 are deposited on the porous plate 143 over the filtration filter 147 or pass through the porous plate 143 to lower the region 141L. Fall).

The pressure inside the regeneration tank 140 is relatively lower than the pressure of the first exhaust pipe 107, and the flow rate of the lower zone 141L is the upper zone 141H in the upper zone 141H and the lower zone 141L. Will be slower than). Therefore, the exhaust gas of the exhaust gas and the catalyst particles 110 introduced into the upper region 141H through the first exhaust pipe 107 is discharged to the atmosphere through the second exhaust pipe 145 by the pressure difference, and the regeneration tank 140 Catalyst particles 110 located inside of the free fall from the top to the bottom.

At this time, the porous plate 143 partitions the inside of the regeneration tank 140 and generates a flow rate difference between the upper section 141H and the lower section 141L, and falls from the catalyst particles 110 having a relatively heavy weight. It is configured to flow into (141L).

The catalyst particles 110 dropped into the lower section 141L are introduced with ammonia and inert gas supplied through the reducing agent supply line 120. The volume ratio of ammonia and inert gas is 3-5% NH ₃ and the remaining 95-97% inert gas (Ar, He, etc.), and the internal temperature of the regeneration tank 140 is 200-400 ^o C at 60 minutes to 120 Maintained for minutes.

SO ₂ adsorbed to the catalyst particles 110 in the regeneration tank 140 under such conditions is separated from the catalyst particles 110 to regenerate the catalyst.

The regenerated catalyst particles 110 are loaded below the regeneration tank 140, and the loaded catalyst particles 110 are recovered into the reaction tank 100 through the recovery supply pipe 170.

On the other hand, the inside of the regeneration tank 140, the heating device 160 is installed can maintain the internal temperature of the regeneration tank 140 to 200-400 ^° C. The heating device 160 allows the exhaust gas exhausted from the coil heater or the engine of the ship to generate heat due to the electrical resistance to be introduced through the regeneration tank before entering the reaction tank 100, thereby using waste heat of the exhaust gas. Can be heated.

On the other hand, although not shown in the drawing, it is possible to quickly separate the SO ₂ adsorbed on the catalyst particles by increasing the contact area between the catalyst and ammonia to be regenerated by installing a stirring device in the lower region of the regeneration tank.

SO ₂ separated from the catalyst particles 110 is collected in the storage tank 150 through a drain pipe 149 connected to the other side of the lower region 141L of the regeneration tank 140. At this time, SO ₂ is collected in the form of sulfate or ammonium sulfate, and largely through two reactions.

This is a process that simply lowers the temperature of the regeneration tank in the presence of sufficient water in the gas, and removes it in the form of sulphate through a reaction between SO ₂ , NH ₃ and moisture, or in the regeneration tank in the absence of sufficient water. Sulfate can be removed in the form of a solid salt by adding water such as Ca (OH) ₂ or an aqueous alkali solution.

100: reactor
101: exhaust gas inlet
103, 143: perforated plate
105: exhaust gas outlet
110: catalyst particles
120: reducing agent supply line
130: inert gas supply line
140: recycling tank
145: second exhaust pipe
147: Filtration Filter
149: drain pipe
150: storage tank
160: heating device
170: recovery supply pipe

Claims (7)

delete A fluidized bed catalytic reaction system using catalyst particles to reduce harmful substances in exhaust gases generated from a ship's engine,
A reaction tank in which catalyst particles are located and reduce harmful substances contained in exhaust gas introduced into the catalyst by catalytic reaction or adsorption,
A regeneration tank that collects catalyst particles from exhaust gas and catalyst particles discharged from the reaction tank and removes and regenerates harmful substances adsorbed;
A recovery supply pipe connecting the regeneration tank and the reaction tank to supply the regenerated catalyst particles to the reaction tank,
The reactor includes an exhaust gas inlet formed in the lower portion of the reactor to allow the exhaust gas generated from the engine to flow therein, and a porous plate having a hole formed therein so that the catalyst particles are seated at the upper portion and the exhaust gas introduced into the lower portion flows upward. And a reducing agent supply line connected to the reaction vessel to supply a reducing agent to the catalyst particles located in the reaction tank, a recovery supply pipe connected to the regeneration tank so that the regenerated catalyst particles are supplied, and exhaust gas from which the harmful substances have been removed from the reaction tank. And an exhaust gas outlet, wherein the reducing agent supply line and the recovery supply pipe are connected to an upper portion of the porous plate fixed inside the reactor.
A fluidized bed catalytic reaction system using catalyst particles to reduce harmful substances in exhaust gases generated from a ship's engine,
A reaction tank in which catalyst particles are located and reduce harmful substances contained in exhaust gas introduced into the catalyst by catalytic reaction or adsorption,
A regeneration tank which collects catalyst particles from exhaust gas and catalyst particles discharged from the reaction tank and removes and regenerates harmful substances adsorbed thereon;
A recovery supply pipe connecting the regeneration tank and the reaction tank to supply the regenerated catalyst particles to the reaction tank,
The regeneration tank comprises a perforated plate dividing the interior into an upper zone and a lower zone, a first exhaust pipe connecting the reactor and the regeneration tank so that the exhaust gas discharged from the reaction tank flows to one side of the upper zone, and an upper zone through the first exhaust pipe. A second exhaust pipe connected to the other side of the upper section to discharge the exhaust gas introduced into the exhaust zone, a reducing agent supply line connected to the regeneration tank so as to supply a reducing agent into the lower section, and a drain pipe for discharging the by-product generated by removing sulfur dioxide from the catalyst particles. And a recovery supply pipe connected to the bottom of the regeneration tank.
The method of claim 3,
Fluidized bed catalytic reaction system, characterized in that the second exhaust pipe, the reducing agent supply line and the drain pipe is equipped with a filtration filter to block the passage of the catalyst particles.
The method of claim 3,
A reducing bed supply line is connected to an inert gas supply line for supplying an inert gas so that the reducing agent and the inert gas are introduced into the lower section of the regeneration tank.
The method of claim 3,
Fluidized bed catalytic reaction system, characterized in that the first exhaust pipe connected to the regeneration tank, the reducing agent supply line and the recovery supply pipe is equipped with a valve to adjust the flow rate.
The method of claim 5,
Fluidized bed catalytic reaction system, characterized in that the volume ratio of reducing agent to inert gas in the reducing agent and inert gas entering the lower zone of the regeneration tank is 3-5% to 95-97%.

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