Auxiliary energy-saving method for heating of ammonia water evaporator

Abstract

The invention discloses a heating auxiliary energy-saving method for an ammonia water evaporator, which is characterized in that a top air inlet of the ammonia water evaporator is communicated with the lower part of an SCR (Selective Catalytic Reduction) denitration tower through a pipeline, and hot flue gas in the SCR denitration tower is introduced into the ammonia water evaporator and is fully mixed with ammonia water in the ammonia water evaporator to complete ammonia water evaporation. According to the invention, flue gas with heat from an SCR denitration process can be used as an ammonia water evaporation heat source, so that ammonia water is gasified to achieve the aim of evaporating the ammonia water. The device is scientific and simple in structure, convenient to use and maintain, obvious in energy-saving effect, high in heat efficiency and capable of assisting in reducing consumption of energy media in operation.

Description

Technical Field

[0001] The invention relates to a heating method for an ammonia water evaporator, and specifically provides a heating auxiliary energy-saving method for an ammonia water evaporator. Background Art

[0002] The evaporator is used in the SCR denitrification process as a key device for the evaporation of liquid ammonia. At present, there are generally two heat sources used for ammonia evaporation, one is steam, and the other is hot air after coal gas combustion. Both methods of evaporating ammonia require energy consumption, which is not conducive to the current development of energy conservation and consumption reduction. In order to reduce the CO in the sintering flue gas in the existing SCR denitrification, a palladium catalyst is loaded in the SCR denitrification tower, so that when the flue gas circulates in the tower body, it first passes through two layers of nitrogen oxide reduction reaction, and then enters the third layer of palladium catalyst CO combustion, which generates a lot of heat after combustion, in order to prevent heat loss. Summary of the invention

[0003] The purpose of the present invention is to provide a method for heating and assisting energy saving of an ammonia evaporator, which can utilize the flue gas with heat from the SCR denitration process as the heat source for evaporation of ammonia, so as to gasify the ammonia to achieve the purpose of evaporating the ammonia. The structure is scientific and simple, and it is easy to use and maintain. It has obvious energy-saving effect and high thermal efficiency, and can assist in reducing the consumption of energy medium during operation.

[0004] The purpose of the present invention is achieved by adopting the following technical scheme: a method for auxiliary energy saving of heating of an ammonia evaporator, connecting the top air inlet of the ammonia evaporator with the lower part of the SCR denitrification tower through a pipe, passing the hot flue gas in the tower into the ammonia evaporator, and fully mixing with the ammonia in the ammonia evaporator to complete the evaporation of ammonia, thereby achieving energy saving effect and reducing the consumption of energy medium during operation.

[0005] The top air inlet of the ammonia evaporator is connected to the lower part of the SCR denitration tower through a pipe and is located on the tower wall below the bottom catalyst layer in the SCR denitration tower.

[0006] The gas outlet at the bottom of the ammonia evaporator is connected to the flue gas inlet of the SCR denitrification tower, and the gas is returned to the SCR denitrification tower for treatment before being discharged.

[0007] Advantages of the present invention:

[0008] 1. The present invention connects the ammonia evaporator with the SCR denitration tower, introduces the hot flue gas with a temperature of 310°C generated by the combustion of CO below the third catalyst layer from top to bottom into the evaporator inlet, gasifies the ammonia water to achieve the purpose of evaporating the ammonia water, has obvious energy-saving effect and high thermal efficiency, and can assist in reducing the consumption of energy media during operation.

[0009] 2. The method provided by the present invention has the advantages of fast equipment transformation and implementation, low investment and quick effect; low requirements on the skill level of installation and construction, and convenient daily maintenance and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the system structure for auxiliary energy saving of heating for an ammonia evaporator according to the present invention. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with specific embodiments.

[0012] A method for heating and assisting energy saving of an ammonia evaporator is provided, wherein the top air inlet of the ammonia evaporator 1 is connected to the lower part of the SCR denitration tower 2 through a pipeline, and the connected part is located on the tower wall below the catalyst layer 3 of the third layer from top to bottom in the SCR denitration tower 2. The tower wall corresponding to the connected part has a 600mm hole, and the pipeline is connected to the hole to achieve the connection between the ammonia evaporator 1 and the lower part of the SCR denitration tower 2. The hot flue gas with a temperature of 310°C generated by the combustion of CO is introduced into the ammonia evaporator, and is fully mixed with 20% concentration ammonia water to complete the evaporation of ammonia water, thereby achieving energy saving effect and reducing the consumption of energy medium during operation.

[0013] The gas outlet at the bottom of the ammonia evaporator 1 is connected to the flue gas inlet of the SCR denitrification tower 2, and the gas is returned to the SCR denitrification tower 2 for treatment and then sent to the chimney 4 for discharge.

Claims

1. A method for heating auxiliary energy saving of an ammonia evaporator, characterized in that: The top air inlet of the ammonia evaporator is connected to the lower part of the SCR denitrification tower through a pipeline, and the hot flue gas in the SCR denitrification tower is introduced into the ammonia evaporator to be fully mixed with the ammonia in the ammonia evaporator to complete the evaporation of ammonia.

2. The method for heating auxiliary energy saving of an ammonia evaporator according to claim 1, characterized in that: The portion where the top air inlet of the ammonia evaporator is connected to the lower part of the SCR denitration tower through a pipeline is located on the tower wall below the bottom catalyst layer in the SCR denitration tower.

3. The method for heating auxiliary energy saving of ammonia evaporator according to claim 1, characterized in that: The gas outlet at the bottom of the ammonia evaporator is connected to the flue gas inlet of the SCR denitrification tower, and the gas is returned to the SCR denitrification tower for treatment and then discharged.

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