Flue gas desulfurization and dust removal system

Abstract

The invention relates to the technical field of combustion pollutant treatment, and discloses a flue gas desulfurization and dust removal system which comprises a desulfurization flue, a desulfurization agent storage device, a desulfurization agent conveying device, a desulfurization agent spraying device, a bag-type dust remover, an exhaust fan and a chimney. A sulfur smoke outlet of the desulfurization flue is connected with an air inlet of the bag-type dust collector, an air outlet of the bag-type dust collector is connected with the exhaust fan through an air outlet pipe, an outlet of the exhaust fan is connected with the chimney, and the desulfurizing agent storage device, the desulfurizing agent conveying device and the desulfurizing agent spraying device are sequentially connected. The desulfurizing agent conveying device is communicated with the desulfurization flue, and the desulfurizing agent spraying device is arranged in the desulfurization flue close to a sulfur smoke inlet. According to the invention, a dry desulfurization process is adopted, so that the flue gas can fully react with the granular desulfurizer, and the emission concentration of SO2 in the flue gas is ensured to reach an ultralow emission standard.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion pollutant treatment, and specifically relates to a flue gas desulfurization and dust removal system. Background Art

[0002] In recent years, with the increasing requirements for environmental protection, key regions across the country have successively proposed ultra-low emission standards for flue gas produced by large power plant boilers. At present, the ultra-low emission standard requires SO2 emission concentration to be less than 50mg / Nm 3 However, under actual production conditions, the operating environment of the desulfurization device is poor, and other particulate matter, HCl, HF and other substances in the flue gas have an impact on the desulfurization reaction, making it difficult for flue gas emissions to meet ultra-low emission standards. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a flue gas desulfurization and dust removal system so that the SO2 emission concentration in the flue gas reaches the ultra-low emission standard.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a flue gas desulfurization and dust removal system, which is characterized by comprising a desulfurization flue, a desulfurizer storage device, a desulfurizer conveying device, a desulfurizer injection device, a bag dust collector, an exhaust fan and a chimney, the sulfur fume inlet of the desulfurization flue is connected to the flue gas duct of the flue gas to be treated, the sulfur fume outlet of the desulfurization flue is connected to the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected to the exhaust fan through an air outlet pipe, the outlet of the exhaust fan is connected to the chimney, the desulfurizer storage device, the desulfurizer conveying device and the desulfurizer injection device are connected in sequence, the desulfurizer conveying device is connected to the desulfurization flue, and the desulfurizer injection device is arranged inside the desulfurization flue near the sulfur fume inlet.

[0005] Furthermore, the desulfurizer is a calcium-based powdered desulfurizer, which is a dry gas desulfurizer at room temperature, can work at room temperature and pressure or under pressurized conditions, and has the characteristics of easy operation, large chlorine capacity, high purification degree, strong adaptability, and reduced filling times compared with ordinary desulfurizers.

[0006] Furthermore, a regulating valve is provided at the outlet of the flue gas duct to facilitate adjusting the flue gas processing volume according to the system operation conditions.

[0007] Furthermore, the discharge port of the desulfurizer storage device is connected to a first feeder, the first feeder is connected to the desulfurizer conveying device, the discharge port of the desulfurizer conveying device is connected to a second feeder, the second feeder is connected to the desulfurizer injection device, and a vibration mechanism is provided on the first feeder and the second feeder to avoid the occurrence of desulfurizer blockage.

[0008] Furthermore, the first feeder and the second feeder are variable frequency feeders, which can adjust the rotation speed of the valve and the spiral device by changing the motor frequency to adjust the supply of the desulfurizer and adapt to the changes in flue gas volume and SO2 concentration under different working conditions.

[0009] Furthermore, the desulfurizing agent injection device comprises a desulfurizing agent driving mechanism, which is used to provide the desulfurizing agent injection device with a force to input the desulfurizing agent into the desulfurization flue. Preferably, the desulfurizing agent driving mechanism is a nitrogen supply system.

[0010] Compared with the prior art, the flue gas desulfurization and dust removal system provided by the present invention adopts a dry desulfurization process, which can ensure that the flue gas and the particulate desulfurizer fully react, can flexibly control the injection amount of the desulfurizer and the flue gas, and has a high desulfurization reaction efficiency. The system has a simple structure, low operating cost, good operating performance, and ensures that the SO2 emission concentration in the flue gas reaches the ultra-low emission standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the plan layout of a flue gas desulfurization and dust removal system provided in an embodiment of the present invention.

[0012] Legend: 1- desulfurization flue; 11- sulfur fume inlet; 12- sulfur fume outlet; 2- flue gas duct; 21- regulating valve; 3- desulfurization agent bin; 4- desulfurization agent injector; 5- bag filter; 51- air inlet; 52- air outlet; 6- air outlet pipe; 7- exhaust fan; 8- chimney. DETAILED DESCRIPTION

[0013] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0014] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0015] At present, the ultra-low emission standard requires SO2 emission concentration to be less than 50mg / Nm 3 However, under actual production conditions, the desulfurization device has a poor operating environment, and other particulate matter, HCl, HF and other substances in the flue gas have an impact on the desulfurization reaction. In addition, when the SO2 content in the flue gas is low, the desulfurization reaction rate is slow, it is difficult to ensure the sufficiency of the reaction, and the desulfurization efficiency is low.

[0016] Based on this, see Figure 1The embodiment of the present invention provides a flue gas desulfurization and dust removal system, which includes a desulfurization flue 1, a desulfurizer bin 3, a desulfurizer conveying device, a desulfurizer injector 4, a bag dust collector 5, an exhaust fan 7 and a chimney 8. The sulfur smoke inlet 11 of the desulfurization flue is connected to the flue gas 2 of the flue gas to be treated, the sulfur smoke outlet 12 of the desulfurization flue is connected to the air inlet 51 of the bag dust collector, the air outlet 52 of the bag dust collector is connected to the exhaust fan 7 through the air outlet pipe 6, and the outlet of the exhaust fan 7 is connected to the chimney 8. The desulfurizer bin 3, the desulfurizer conveying device, and the desulfurizer injector 4 are connected in sequence, the desulfurizer conveying device is connected to the desulfurization flue 1, and the desulfurizer injector 4 is arranged inside the desulfurization flue near the sulfur smoke inlet.

[0017] In this embodiment, a regulating valve 21 is provided at the outlet of the flue gas duct 2 of the present disclosure, so as to adjust the processing amount of the flue gas according to the system operation conditions.

[0018] In this embodiment, the present disclosure is provided with an independent desulfurizer bin 3, which is provided with a sealing structure, and its feed port is connected to the desulfurizer filling pipeline, which is convenient for desulfurizer filling. The discharge port of the desulfurizer bin 3 of the present disclosure is connected to the first feeder, the first feeder is connected to the desulfurizer conveying device, the discharge port of the desulfurizer conveying device is connected to the second feeder, and the second feeder is connected to the desulfurizer injector 4. The first feeder and the second feeder are provided with a vibration mechanism to avoid the occurrence of desulfurizer blockage.

[0019] In this embodiment, the desulfurizer injector 4 of the present disclosure includes a desulfurizer driving mechanism, which is used to provide the desulfurizer injector with a force to input the desulfurizer into the desulfurization flue. In a preferred embodiment, the desulfurizer driving mechanism can be configured as a nitrogen supply system, and the desulfurizer is injected into the desulfurization pipeline by blowing nitrogen.

[0020] In a preferred embodiment, the desulfurizer is a calcium-based powdered desulfurizer, which is a dry gas room-temperature desulfurizer that can work at room temperature and pressure or under pressurized conditions. It has the characteristics of easy operation, large chlorine capacity, high purification degree, strong adaptability, and can reduce the number of filling times compared with ordinary desulfurizers.

[0021] The workflow of the flue gas desulfurization and dust removal system provided in this embodiment includes the following steps:

[0022] S1: The flue gas to be treated enters the desulfurization flue 1 from the sulfur smoke inlet 11 through the flue gas flue 2, the desulfurizer stored in the desulfurizer bin 3 enters the desulfurizer conveying device through the first feeder, and enters the desulfurizer injector 4 through the second feeder after being conveyed by the desulfurizer conveying device, and the desulfurizer injector 4 injects the desulfurizer into the desulfurization flue 1;

[0023] S2: The flue gas contacts the desulfurizer in the desulfurization flue 1 and undergoes a chemical reaction, solidifying and removing the sulfur dioxide in the sulfur smoke. After desulfurization, the powdery particles enter the bag filter 5 with the air flow for secondary purification. The flue gas after secondary purification is extracted by the exhaust fan 7 and discharged through the chimney 8.

[0024] The flue gas treated by the system of the embodiment of the present invention is fully contacted with the desulfurization agent in the desulfurization flue 1 and undergoes a chemical reaction to achieve solidification and removal of SO2. The desulfurized flue gas is discharged from the chimney after secondary purification by the bag filter 5. The final SO2 emission concentration is less than 20mg / Nm 3 , meeting emission standards.

[0025] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A flue gas desulfurization and dust removal system, characterized in that: It includes a desulfurization flue, a desulfurizer storage device, a desulfurizer conveying device, a desulfurizer injection device, a bag dust collector, an exhaust fan and a chimney. The sulfur smoke inlet of the desulfurization flue is connected to the flue gas duct of the flue gas to be treated, the sulfur smoke outlet of the desulfurization flue is connected to the air inlet of the bag dust collector, the air outlet of the bag dust collector is connected to the exhaust fan through an air outlet pipe, the outlet of the exhaust fan is connected to the chimney, the desulfurizer storage device, the desulfurizer conveying device and the desulfurizer injection device are connected in sequence, the desulfurizer conveying device is connected to the desulfurization flue, the desulfurizer injection device is arranged inside the desulfurization flue near the sulfur smoke inlet, and the desulfurizer injection device makes the desulfurizer fully contact with the flue gas.

2. A flue gas desulfurization and dust removal system according to claim 1, characterized in that: The desulfurizer is a calcium-based powdered desulfurizer.

3. A flue gas desulfurization and dust removal system according to claim 1, characterized in that: A regulating valve is arranged on the outlet of the flue gas duct.

4. A flue gas desulfurization and dust removal system according to claim 1, characterized in that: The discharge port of the desulfurizer storage device is connected to the first feeder, the first feeder is connected to the desulfurizer conveying device, the discharge port of the desulfurizer conveying device is connected to the second feeder, the second feeder is connected to the desulfurizer injection device, and the first feeder and the second feeder are provided with a vibration mechanism.

5. A flue gas desulfurization and dust removal system according to claim 1, characterized in that: The first feeder and the second feeder are variable frequency feeders.

6. A flue gas desulfurization and dust removal system according to claim 1, characterized in that: The desulfurizing agent injection device comprises a desulfurizing agent driving mechanism, and the desulfurizing agent driving mechanism is used to provide the desulfurizing agent injection device with a force to input the desulfurizing agent into the desulfurization flue.

7. A flue gas desulfurization and dust removal system according to claim 6, characterized in that: The desulfurizing agent driving mechanism is a nitrogen supply system.

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