KR19980021667A - Ammonia Gas Mixing Equipment in Selective Catalytic Reaction Tower (SCR) for Waste Incinerator - Google Patents

Abstract

An object of the present invention is to increase the effect of injecting ammonia gas into a catalyst tower which is a device for treating dioxin, which is a highly toxic organic chlorine compound, and nitrogen oxides (NOx) among the harmful gases generated during the combustion of waste in an incinerator. The present invention relates to an ammonia gas mixing device in a selective catalytic reaction tower (SCR) for a waste incinerator, which can simultaneously extend the life of the catalyst.

According to the configuration of the present invention, a first mixer 26 is provided between the supply nozzles 30 for supplying ammonia water or ammonia gas to the catalyst tower 10 to enhance the mixing effect with the combustion gas, and ammonia thereon. And a second mixer (28) for inducing a uniform flow and diffusion of the mixed combustion gas, and the second duct (14) and the catalyst layer (24) to which the first and second mixers (26, 28) are connected. It is composed of a guide vane 34 to uniformly contact the combustion gas to the entire surface of the catalyst layer 24 to the connecting duct 16 of the first duct 12 to connect the.

Description

Ammonia Gas Mixing Equipment in Selective Catalytic Reaction Tower (SCR) for Waste Incinerator

The present invention enhances the effect of injecting ammonia gas into a catalyst tower which is a device for treating dioxin, which is a highly toxic organic chlorine compound, and nitrogen oxides (NOx) in a waste incinerator. The present invention relates to an ammonia gas mixing device in a selective catalytic reaction tower (SCR) for a waste incinerator, which can extend the life of the catalyst and at the same time, in particular, from the gas nozzle inside the second duct in which the ammonia gas nozzle is installed. The first and second mixers for inducing diffusion of ammonia gas to be supplied up and down, and a plurality of guide vanes are provided as connection ducts connecting the second ducts and the first ducts provided with the catalyst layer. Effective combustion of ammonia gas to the catalyst tower by ensuring that the combustion gas diffused through It relates to an ammonia gas mixing device in the catalytic reaction tower (SCR) for waste incinerators that to extend the life of the catalyst with the mouth.

In general, the waste incinerator is equipped with an SCR catalyst tower, which is a device for treating noxious gas generated during the combustion process of waste, which includes a gas / gas heat exchanger, an ammonia injector, an ammonia mixture device, a catalyst layer having a multilayer structure, It consists of a catalyst tower casing, and an ammonia mixing device is essentially installed to treat nitrogen oxides (NOx) and dioxins, which are highly toxic organic chlorine compounds, generated during the combustion of waste.

Before installing the ammonia mixing device in the actual catalyst tower, consideration should be given to reducing the entire casing to an appropriate scale by the flow rate of the incoming combustion gas, the temperature of the combustion gas, the concentration of nitrogen oxides included, and the ammonia injection concentration accordingly. After performing a model test, it is desirable to select the most efficient design and apply it to the actual catalyst tower.

Conventional SCR catalyst towers also consist of a gas / gas heat exchanger, an ammonia injector, an ammonia mixer and a catalyst bed and finally, a catalyst tower casing, which is a non-uniform combustion gas when the ammonia mixer is not installed or improperly installed. Forming a stream of nitrogen oxides (NOx) and dioxins (Dioxin) to shorten the life of the catalyst to remove, there was a problem that the removal efficiency of nitrogen oxides and dioxins is significantly reduced.

The present invention has been made in consideration of the above circumstances, and an object thereof is to more efficiently remove nitrogen oxides and dioxins, which are harmful gases in the combustion gas generated in a waste incinerator, and also to shorten the life of the catalyst layer due to the harmful gases. It is to provide an ammonia gas mixing device in a selective catalytic reaction tower (SCR) for the waste incinerator that can be prevented.

The present invention is to supply ammonia water or ammonia gas to the catalyst tower to mix nitrogen gas and ammonia gas in the catalyst tower to remove the nitrogen oxide and dioxin in the harmful gas generated in the waste combustion process of the waste incinerator in order to achieve the above object. In the apparatus, a first mixer is provided between the supply nozzles for supplying the ammonia water or ammonia gas to the catalyst tower to enhance the mixing effect with the combustion gas, and the combustion gas mixed with the ammonia is uniformly flowed thereon. And a second mixer for inducing diffusion, and a duct connecting the second duct connecting the first and second mixers to the first duct connecting the catalyst layer so that the combustion gas is uniformly contacted with the entire surface of the catalyst layer. Remove the ammonia gas mixing device from the selective catalytic reaction tower (SCR) for waste incinerator As it is accomplished by.

1 is a perspective view of a hazardous gas treatment catalyst tower to which the present invention is applied

※ Explanation of codes for main parts of drawing

(10): catalyst tower (12): first duct

14: second duct 16: connection duct

(18): heat exchanger 20: inlet duct

(22): outlet duct 24: catalyst bed

26: the first mixer 28: the second mixer

30: supply nozzle 32: burner

(34): guide vane

1 shows an ammonia gas mixing device of a hazardous gas treatment catalyst tower for a waste incinerator according to the present invention, wherein the ammonia gas mixing device in a selective catalytic reaction tower (SCR) for a waste incinerator includes a heat exchange unit 18 and a gas. Inlet duct 20 is provided, the first duct 12 is provided with a plurality of catalyst layers 24, the supply nozzle 30 for supplying ammonia water or ammonia gas is provided, the combustion burner 32 is provided It is composed of a catalyst tower 10 having a second duct 14 and a connection duct 16 connecting the first and second ducts 12 and 14.

As a supply nozzle 30 for supplying the ammonia water and the ammonia gas of the second duct 14, a first mixer 26 and a second mixer 28 are installed thereon.

The first mixer 26 diffuses the combustion gas that has passed through the gas / gas heat exchanger 18, thereby enhancing the mixing effect of the ammonia water or the ammonia gas and the combustion gas supplied from the supply nozzle 30. .

The second mixer 28 induces the diffusion of the combustion gas so that the combustion gas mixed with ammonia has a uniform flow.

A plurality of guide vanes 34 are installed in the connecting ducts 16 of the first and second ducts 12 and 14, which are guided by the second mixer 28. It is a combustion gas inducing means for ensuring that the diffused combustion gas is uniformly in contact with the entire area of the catalyst layer 24 without being biased in either direction in the catalyst layer 24 positioned at the top of the first duct 12.

The supply nozzle 30 is to inject the ammonia water and gas supplied from the ammonia storage tank (not shown) through an ammonia supply pump (not shown) into the catalyst tower 10.

In other words, in order to remove nitrogen oxides and dioxins from harmful gases generated during the waste combustion process of a waste incinerator in a catalyst tower, ammonia water or ammonia gas is supplied to the catalyst tower and mixed with the combustion gas. A first mixer 26 is provided between the supply nozzles 30 for supplying the gas to the catalyst tower 10 to enhance the mixing effect with the combustion gas, and the combustion gas mixed with ammonia is uniformly disposed thereon. A first duct connecting the catalyst layer 24 and the second duct 14 to which the first and second mixers 26 and 28 are connected; A guide vane 34 for uniformly contacting the combustion gas to the entire surface of the catalyst layer 24 is provided by the connecting duct 16 of 12).

Reference numeral 22 in the accompanying drawings is an outlet duct of the gas.

Referring to Figure 1 will be described the effect of the present invention.

The combustion gas generated in the incinerator and passing through the heat exchange unit 18 is effectively mixed with ammonia water or ammonia gas supplied through the supply nozzle 30 while being diffused in the first mixer 26, and then the second mixer 28. The mixed combustion gas induces uniform flow and diffusion to come into contact with the uppermost catalyst layer 24 of the first duct 12 through the guide vanes 34.

The mixed combustion gas passing through the guide vanes 34 is in uniform contact with the entire surface of the catalyst layer 24 without being biased along the guide vanes 34.

Therefore, the ammonia water or the ammonia gas supplied through the supply nozzle 30 is more effectively mixed with the combustion gas passing through the heat exchange unit 18 and at the same time is in uniform contact with the catalyst layer 24 through the guide vanes 34. .

Therefore, while injecting and mixing effects of ammonia gas into dioxins, which are highly toxic organic chlorine compounds generated during the combustion of wastes, and catalyst towers, which treat nitrogen oxides (NOx), It is possible to extend the life of the catalyst layer by contacting the uniform catalyst layer.

Claims (1)

In the apparatus for supplying ammonia water or ammonia gas to the catalyst tower in order to remove the nitrogen oxides (NOx) and dioxin of the harmful gases generated during the waste combustion process of the waste incinerator in the catalyst tower, Between the supply nozzle 30 for supplying the ammonia water or ammonia gas to the catalyst tower 10 is installed a first mixer 26 to enhance the mixing effect with the combustion gas, the upper portion of the combustion mixed with ammonia The second mixer 28 is installed to induce a uniform flow and diffusion of the gas, and connects the second duct 14 and the catalyst layer 24 provided with the first and second mixers 26 and 28. Selective catalytic reaction tower (SCR) for a waste incinerator, characterized in that the guide vanes 34 for uniformly contacting the combustion gas in contact with the entire surface of the catalyst layer 24 to the connecting duct 16 of the first duct 12. ) Ammonia gas mixing device of the document.