SCR (Selective Catalytic Reduction) reaction device with low heat loss and high safety

Abstract

The utility model discloses a low heat loss and high safety SCR (Selective Catalytic Reduction) reaction device, which comprises a hot blast stove combustion fan, an air pipeline and an SCR reactor, the top of the SCR reactor is provided with a flue gas inlet, the SCR reactor is internally provided with a support girder, and the support girder is of a cavity structure; an air inlet and an air outlet are formed in the two ends of the cavity structure in the horizontal direction respectively; the air inlet is connected with a combustion fan of the hot blast stove through an air pipeline; hot flue gas exchanges heat with air in the supporting girder through the flue gas inlet. Through heat exchange between the supporting girder and heat in smoke, heat recycling is achieved, and heat loss and safety of the supporting girder are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to equipment design and processing manufacturing technical field, concretely relates to a low heat loss and high safety's SCR reaction device. BACKGROUND

[0002] The selective catalytic reduction reactor (SCR reactor) is a kind of steel structure body with multiple layers of catalysts loaded inside and provides residence space for the required chemical reduction reaction.In the SCR reactor, the reducing agent (usually ammonia) and NO x In the flue gas react chemically to generate harmless nitrogen and water vapor.To ensure the activity and reaction efficiency of the catalyst, the temperature of the reaction process is usually 200-450 DEG C.The support beam of the SCR reactor is a box beam made of carbon steel, which is used to carry the catalyst.The allowable stress of the carbon steel support beam decreases at high temperature, and the long-term temperature instability also causes the metal (carbon steel) to repeatedly expand and contract, causing metal fatigue of the carbon steel support beam, thereby reducing the safety of the carbon steel support beam.

[0003] In addition, in the SCR denitration project commonly used in the steel smelting industry flue gas treatment, hot blast furnace heating flue gas technology is often used, and the fuel of the hot blast furnace comes from blast furnace gas, converter gas or coke oven gas.Coal gas combustion needs combustion-supporting air, and the temperature of combustion-supporting air in winter directly affects the consumption of coal gas, and when the temperature of combustion-supporting air is too low, more coal gas fuel than usual needs to be consumed to ensure the safe operation of the rear end.

[0004] The hot blast furnace combustion-supporting air blower in the traditional hot blast furnace flue gas heating technology directly draws atmospheric air into the blower, pressurizes the air through the blower, and then delivers it to the hot blast furnace body burner through the pipeline, mixes with the coal gas, and burns in the hot blast furnace combustion chamber.The power plant uses steam to heat the combustion-supporting air by increasing an external heat source, which will inevitably cause a certain waste of resources. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a low heat loss and high safety's SCR reaction device, which solves the heat loss and safety problems of the support beam by recycling the heat of the lowest layer of catalysts in the SCR reactor and the flue gas.

[0006] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme:

[0007] The embodiment of the utility model provides a kind of low heat loss and high safety's SCR reaction device, including hot blast furnace combustion-supporting fan, air pipeline, SCR reactor, the top of the SCR reactor is equipped with flue gas inlet, the support beam is equipped in the SCR reactor, and the support beam is cavity structure;The two ends of the horizontal direction of the cavity structure are respectively provided with air inlet and air outlet;The air inlet is connected with hot blast furnace combustion-supporting fan by air pipeline;Hot flue gas exchanges heat with air in support beam by flue gas inlet.

[0008] As further technical solutions, it further includes hot blast furnace, and the air outlet is connected with the inlet of the hot blast furnace.

[0009] As further technical solutions, it further includes catalyst, and the catalyst is arranged on the support beam.

[0010] As further technical solutions, the bottom of the SCR reactor is provided with a flue gas outlet.

[0011] As further technical solutions, the support beam is horizontally arranged in the SCR reactor.

[0012] As further technical solutions, the support beam is the support beam for placing catalyst in the bottom layer of the SCR reactor.

[0013] As further technical solutions, the support beam is a rectangular cavity structure.

[0014] As further technical solutions, the support beam is a metal support beam.

[0015] As further technical solutions, the support beam is a carbon steel support beam.

[0016] As further technical solutions, it further includes a fan, and the hot flue gas exchanges heat with air in the support beam from top to bottom under the action of the fan.

[0017] The beneficial effects of the above embodiments of the utility model are as follows:

[0018] (1) the support beam for placing catalyst in the lowermost layer of the SCR reactor is designed as a rectangular cavity structure, the two ends of the rectangular cavity are provided with air inlet and air outlet respectively, hot flue gas is used to exchange heat with air in the support beam, so that the support beam is kept in low temperature section for a long time, the allowable stress of the support beam is improved, and the safety of the support beam is ensured.

[0019] (2) no additional heat source is needed, hot flue gas is used to exchange heat with air in the support beam, the hot air formed is used as combustion-supporting air, and the combustion-supporting air is sent into the hot blast furnace through pipeline. The heat originally lost into the atmosphere is collected and sent to the hot blast furnace to participate in combustion, the combustion temperature is improved, and the consumption of coal gas is reduced. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a schematic diagram of the SCR reaction device in this utility model;

[0022] The diagram is for illustrative purposes only.

[0023] Among them, the hot blast stove combustion fan (1), air duct (2), SCR reactor (3), supporting beam (4), and catalyst (5) are included. Detailed Implementation

[0024] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] Example 1

[0026] In a typical embodiment of this utility model, such as Figure 1 As shown, a low-heat-loss and high-safety SCR reactor is provided, including a hot blast stove combustion blower (1), an air duct (2), an SCR reactor (3), and a hot blast stove (not shown in the figure). The hot blast stove combustion blower (1) is used to send air (from the atmosphere) into the SCR reactor (3) through the air duct (2). The SCR reactor (3) is used for the reaction of a reducing agent (usually ammonia) with NO in the flue gas. x A chemical reaction occurs under the action of a catalyst, producing harmless nitrogen and water vapor. The hot blast stove is used for the combustion of blast furnace gas, converter gas, or coke oven gas.

[0027] The SCR reactor (3) has a flue gas inlet at the top and a flue gas outlet at the bottom. A supporting beam (4) is located at the bottom of the interior of the SCR reactor (3), and a catalyst (5) is located on the upper surface of the supporting beam (4). The supporting beam (4) has a rectangular cavity structure. An air inlet and an air outlet are respectively located at both ends of the rectangular cavity structure. The air inlet is connected to the combustion fan (1) of the hot blast stove via an air duct (2). The air outlet is connected to the hot blast stove via a duct.

[0028] The flue gas import is used for sending the high-temperature hot flue gas from the chemical industry, petroleum, metallurgy, electric power and other industries downwardly through the catalyst and then through the support beam (4) by the fan.

[0029] The air in the air import and air export of the support beam (4) exchanges heat with the hot flue gas, reduces the temperature of the support beam (4), keeps the support beam in the low-temperature section for a long time, improves the allowable stress of the support beam and ensures the safety of the support beam.

[0030] The air after heat exchange is used as the combustion-supporting air, the combustion-supporting air is sent into the hot blast stove through the pipeline, the heat originally dissipated into the atmosphere is collected and sent to the hot blast stove to participate in combustion, the combustion temperature is improved and the coal gas consumption is reduced.

[0031] The working process of the SCR reaction device with low heat loss and high safety in the utility model is as follows:

[0032] The hot blast stove combustion-supporting fan (1) is started, the air (from the atmosphere) is sent into the air import of the support beam (4) through the air pipeline (2), meanwhile, the flue gas is sent downwardly through the flue gas import under the action of the fan, the air in the support beam (4) is heat-exchanged after passing through the catalyst (5), the hot air after heat exchange is connected with the hot blast stove through the air export and the pipeline, the flue gas after heat exchange is discharged from the SCR reactor (3) through the flue gas export.

[0033] The above only describes the preferred embodiments of the utility model and is not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes, any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A low heat loss and high safety SCR reaction device, comprising a hot blast stove combustion-supporting fan, an air pipeline and an SCR reactor, characterized in that, The top of the SCR reactor is provided with a flue gas inlet, the SCR reactor is provided with a support beam, and the support beam is a cavity structure; the two ends of the cavity structure in the horizontal direction are respectively provided with an air inlet and an air outlet; the air inlet is connected with an air duct and a hot blast stove combustion-supporting fan; the hot flue gas exchanges heat with the air in the support beam through the flue gas inlet.

2. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The hot blast stove is further included, and the air outlet is connected with the inlet of the hot blast stove.

3. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The catalyst is further included, and the catalyst is arranged on the support beam.

4. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The bottom of the SCR reactor is provided with a flue gas outlet.

5. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The support beam is horizontally arranged in the SCR reactor.

6. The low heat loss and high safety SCR reaction apparatus according to claim 5, wherein The support beam is a support beam for placing the catalyst at the bottom layer inside the SCR reactor.

7. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The support beam is a rectangular cavity structure.

8. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The support beam is a metal support beam.

9. The low heat loss and high safety SCR reaction apparatus according to claim 8, wherein The support beam is a carbon steel support beam.

10. The low heat loss and high safety SCR reaction apparatus according to claim 1, wherein The fan is further included, and the hot flue gas exchanges heat with the air in the support beam from top to bottom under the action of the fan.

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