Active coke desulfurization and denitrification system acid tail gas circulation mechanism

Abstract

The utility model provides a kind of active coke desulfurization and denitrification system acid tail gas circulation mechanism, belong to desulfurization and denitrification technical field, including dry suction system and its acid tail gas's conveying pipeline, including branch pipe, one end of branch pipe is connected in conveying pipeline;Gas inlet of dry suction system is equipped with connecting pipeline, and exhaust assembly is equipped on connecting pipeline, and exhaust assembly is connected with branch pipe;Exhaust assembly can part of tail gas in conveying pipeline is backflowed to connecting pipeline through branch pipeline;The utility model can extract part from the tail gas discharged from dry suction system last, and re-circulate in the acid production area of dry suction system, without re-circulation, improve the acid production efficiency, reduce the amount of unreacted sulfur dioxide tail gas into desulfurization and denitrification system at the same time, reduce sulfur dioxide outlet data, ensure the stability of emission data.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a sulfuric acid tail gas circulation mechanism for an activated coke desulfurization and denitrification system. Background Technology

[0002] With the promotion and application of flue gas activated coke desulfurization and denitrification technology, the desulfurization and denitrification system consists of a purification system and a dry absorption system. After the dry absorption system separates the concentrated sulfuric acid, the remaining unreacted sulfur dioxide will be transported back to the desulfurization and denitrification system for recycling.

[0003] However, after the remaining sulfur dioxide exhaust gas re-enters the system, it needs to undergo pretreatment by the purification system and reaction adsorption by the dry absorption system, resulting in a significant increase in the time consumed per cycle. Compared to the flue gas treated initially, the path of the recirculated exhaust gas is repeated and needs to be adapted to the existing airflow balance within the system, which reduces the effective number of acid production reactions per unit time, thus significantly reducing the acid production efficiency. Furthermore, due to the multiple cycles of sulfur dioxide within the system, the sulfur dioxide data at the flue gas outlet of the desulfurization and denitrification system is too high, which adversely affects the stability of environmental emission data. Utility Model Content

[0004] In view of this, the present invention provides a sulfuric acid tail gas circulation mechanism for an activated coke desulfurization and denitrification system, which can extract a portion of the tail gas discharged from the dry absorption system and return it to the sulfuric acid production area of ​​the dry absorption system for circulation and sulfuric acid production without the need for recirculation. This improves the sulfuric acid production efficiency while reducing the amount of unreacted sulfur dioxide tail gas entering the desulfurization and denitrification system, reducing the sulfur dioxide outlet data, and ensuring the stability of emission data.

[0005] To solve the above-mentioned technical problems, this utility model provides a sulfuric acid tail gas circulation mechanism for an activated coke desulfurization and denitrification system, including a dry absorption system and a conveying pipeline. The conveying pipeline is located at the exhaust port of the dry absorption system. The sulfur dioxide tail gas generated after the dry absorption system produces sulfuric acid is discharged into the conveying pipeline. The system also includes a branch pipe, one end of which is connected to the conveying pipeline. A connecting pipe is provided at the air inlet of the dry absorption system. An air extraction component is provided on the connecting pipe and is connected to the branch pipe. The air extraction component can return a portion of the tail gas in the conveying pipeline to the connecting pipe via the branch pipe.

[0006] The end of the connecting pipe is connected to the air outlet of the purification system. The purification system removes the gum powder in the sulfur dioxide flue gas and cools the flue gas. The purified sulfur dioxide enters the dry absorption system through the connecting pipe.

[0007] The extraction assembly is a distribution valve, which is installed on the connecting pipe. The outlet end of the distribution valve is connected to the inside of the connecting pipe, and the extraction end of the distribution valve is connected to the branch pipe. By extracting air through the distribution valve, the branch pipe is in a negative pressure state, so that some of the sulfur dioxide tail gas in the conveying pipe will enter the negative pressure branch pipe and then enter the inside of the connecting pipe through the branch pipe.

[0008] A booster fan is installed at the outlet section of the conveying pipeline. The outlet of the booster fan is connected to the gas inlet of the desulfurization and denitrification system. The booster fan overcomes the resistance of the negative pressure in the branch pipe when sulfur dioxide is conveyed in the conveying pipeline, so that sulfur dioxide can be conveyed normally in the conveying pipeline while ensuring that sulfur dioxide is not completely drawn into the branch pipe.

[0009] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0010] 1. When using this utility model, a portion of the exhaust gas discharged from the dry absorption system can be extracted and returned to the acid production area of ​​the dry absorption system for acid production, eliminating the need for recirculation and improving acid production efficiency.

[0011] 2. When this utility model is used, it reduces the amount of unreacted sulfur dioxide tail gas entering the desulfurization and denitrification system, lowers the sulfur dioxide outlet data, and ensures the stability of emission data. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0013] Explanation of reference numerals in the attached figures:

[0014] 100. Purification system; 200. Dry suction system; 201. Connecting pipe; 202. Delivery pipe; 203. Booster fan; 300. Branch pipe; 301. Air distribution valve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0016] A sulfuric acid tail gas recirculation mechanism for an activated coke desulfurization and denitrification system, such as Figure 1As shown: This includes a dry adsorption system 200 and a conveying pipe 202. The conveying pipe 202 is located at the exhaust port of the dry adsorption system 200. The sulfur dioxide tail gas generated after acid production by the dry adsorption system 200 is discharged into the conveying pipe 202. It also includes:

[0017] A branch pipe 300 is installed on the conveying pipeline 202. One end of the branch pipe 300 is connected to the outer wall of the conveying pipeline 202, and the branch pipe 300 and the conveying pipeline 202 are interconnected.

[0018] The dry suction system 200 is provided with a connecting pipe 201 at the air inlet. The dry suction system 200 and the purification system 100 are connected to each other through the connecting pipe 201. The connecting pipe 201 is provided with an air extraction component, which is connected to the branch pipe 300.

[0019] The dry absorption system 200 consists of a drying tower, a primary converter, a primary absorption system, a secondary converter, and a secondary absorption system. The primary and secondary converters are both conversion systems. After sulfur dioxide is converted into acid through the conversion system in the dry absorption system 200, sulfur trioxide is discharged. The remaining unreacted sulfur dioxide tail gas enters the conveying pipe 202 and is then transported to the purification system 100 for circulation and purification. When the sulfur dioxide tail gas passes through the conveying pipe 202, a portion of the sulfur dioxide tail gas in the conveying pipe 202 can be drawn into the branch pipe 300 by the air extraction component. Through the branch pipe 300, it enters the connecting pipe 201, allowing this portion of the extracted tail gas to re-enter the dry absorption system 200 for conversion. This reduces the step of passing through the purification system 100. After the acid-producing tail gas is discharged, the tail gas can directly re-enter the dry absorption system 200, simplifying the process and eliminating the need for recirculation. This improves the acid-producing efficiency while reducing the amount of tail gas discharged from the conveying pipe 202, thereby reducing the sulfur dioxide emission data and ensuring the stability of the emission data.

[0020] Specifically, the end of the connecting pipe 201 is connected to the air outlet of the purification system 100. The purification system 100 consists of a first reverse tower, a packed tower, a second reverse tower and an electrostatic precipitator. The purification tower removes the gum powder in the sulfur dioxide flue gas and cools the flue gas. The purified sulfur dioxide enters the dry absorption system 200 through the connecting pipe 201.

[0021] It is worth mentioning that some of the sulfur dioxide exhaust gas extracted from the conveying pipe 202 will enter the connecting pipe 201, so that the excess exhaust gas and the exhaust gas discharged from the purification system 100 will enter the dry absorption system 200 for conversion.

[0022] Specifically, the extraction component is a distribution valve 301, which is installed on the connecting pipe 201. The outlet end of the distribution valve 301 is connected to the inside of the connecting pipe 201, and the extraction end of the distribution valve 301 is connected to the branch pipe 300. By extracting air through the distribution valve 301, the branch pipe 300 is put into a negative pressure state, so that some of the sulfur dioxide tail gas in the conveying pipe 202 will enter the negative pressure state of the branch pipe 300 and enter the inside of the connecting pipe 201 through the branch pipe 300.

[0023] Furthermore, a booster fan 203 is installed at the outlet section of the conveying pipeline 202. The outlet of the booster fan 203 is connected to the gas inlet of the desulfurization and denitrification system. The booster fan 203 overcomes the resistance of the negative pressure in the branch pipe 300 when sulfur dioxide is conveyed in the conveying pipeline 202, so that sulfur dioxide can be conveyed normally in the conveying pipeline 202 while ensuring that sulfur dioxide is not completely drawn into the branch pipe 300.

[0024] First, it should be clarified that this utility model relates to a desulfurization and denitrification system, mainly used to optimize the tail gas circulation in the desulfurization and denitrification system. It should be clarified here that the purification system 100, the dry suction system 200, and the booster fan 203 are all existing desulfurization and denitrification systems. Since the main innovation of this utility model lies in the branching of sulfur dioxide tail gas, the internal equipment of the dry suction system 200 and the purification system 100 will not be limited again, nor will their internal structure be described in detail. Only the usage method and installation position of the booster component and the branch pipe 300 will be described in detail.

[0025] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A sulfuric acid tail gas circulation mechanism for an activated coke desulfurization and denitrification system, comprising a dry absorption system (200) and a conveying pipeline (202) for the sulfuric acid tail gas, characterized in that, include: A branch pipe (300), one end of which is connected to the conveying pipe (202); The dry suction system (200) has a connecting pipe (201) at its air inlet, and an air extraction component is provided on the connecting pipe (201). The air extraction component is connected to the branch pipe (300). The extraction assembly can return a portion of the exhaust gas in the delivery pipe (202) to the connecting pipe (201) via the branch pipe (300).

2. The acid tail gas recirculation mechanism of an activated coke desulfurization and denitrification system as described in claim 1, characterized in that: The end of the connecting pipe (201) is connected to the air outlet of the purification system (100).

3. The acid tail gas recirculation mechanism of an activated coke desulfurization and denitrification system as described in claim 1, characterized in that: The air extraction component is an air distribution valve (301), which is installed on the connecting pipe (201). The air outlet of the air distribution valve (301) is connected to the connecting pipe (201).

4. The acid tail gas recirculation mechanism of an activated coke desulfurization and denitrification system as described in claim 1, characterized in that: The outlet section of the conveying pipeline (202) is equipped with a booster fan (203), and the outlet of the booster fan (203) is connected to the gas inlet of the desulfurization and denitrification system.

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