Device and method for coordinated treatment of flue gas desulfurization wastewater and organic pollutants

Abstract

The present invention relates to a device and method for the coordinated treatment of flue gas desulfurization wastewater and organic pollutants. The device and method of the present invention are composed of an adsorbent injection device, a primary dust removal device, a fine particle removal device, a desulfurization device, a desulfurization wastewater concentration device, a material mixing and stirring device, a mixed material circulating fluidized bed incineration device, etc. The present invention has high efficiency in the removal and harmless treatment of desulfurization wastewater and organic pollutants, low operating cost, convenient maintenance and operation, and is suitable for the purification of pollutants in industries such as coal burning, oil burning and garbage incineration.

Description

Technical Field

[0001] The present invention relates to a device and method for the coordinated treatment of flue gas desulfurization wastewater and organic pollutants, and in particular to a device and method for the harmless coordinated treatment of industrial flue gas desulfurization wastewater and organic pollutants, which is composed of an adsorbent injection device, a primary dust removal device, a fine particle removal device, a desulfurization device, a desulfurization wastewater concentration device, a material mixing and stirring device, and a mixed material circulating fluidized bed incineration device. Background Art

[0002] The wastewater from coal-fired flue gas desulfurization is highly acidic, has high salinity, and has complex pollutant composition, which makes it extremely difficult to control equipment and processes. The various types of organic pollutants discharged from industries, which have great environmental and ecological hazards and different properties, have also become the difficulty in controlling industrial flue gas pollutants. At present, the processes and devices being tested and applied have not achieved efficient prevention, control, removal and treatment effects, and the processes are complex, the operating stability is poor, the equipment investment is large, and the operating and maintenance costs are high.

[0003] The present invention adopts a device and method for the harmless coordinated treatment of flue gas desulfurization wastewater and organic pollutants to efficiently remove and harmlessly treat industrial flue gas desulfurization wastewater and organic pollutants. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for the coordinated treatment of flue gas desulfurization wastewater and organic pollutants, which relates to a harmless coordinated treatment device and method which is compactly combined with an adsorbent injection device, a primary dust removal device, a fine particle removal device, a desulfurization device, a desulfurization wastewater concentration device, a material mixing and stirring device, a mixed material circulating fluidized bed incineration device, etc. The present invention has high efficiency in the removal and harmless treatment of desulfurization wastewater and organic pollutants, low operating cost, and convenient maintenance and operation, and is suitable for the purification of pollutants in industries such as coal burning, oil burning and garbage incineration.

[0005] To achieve the above purpose, the adsorbent injection device of the present invention is arranged in the high-temperature flue at the tail of the boiler. The adsorbent injected is a porous particle with rich specific surface area formed by activation and modification of high-calcium carbon-containing fly ash, which has a very strong physical and chemical adsorption function. After the adsorbent is sprayed into the high-temperature flue at the tail of the boiler through this device, the ultra-fine pores, metal oxide catalytic sites, etc. rich in it have a strong physical and chemical adsorption effect on the organic pollutants and their precursors in the high-temperature flue gas, and after the adsorbent is injected into the flue, it is evenly dispersed in the flue gas, and the physical and chemical adsorption capture efficiency of the organic pollutants and their precursors in the flue gas is high and the effect is good.

[0006] In order to achieve the above-mentioned purpose, the primary dust removal device of the present invention serves as a pre-dust removal device. Most of the large dust particles in the flue gas are captured by the primary dust removal device, and the remaining fine particles including high-calcium and carbon-containing fly ash enter the fine particle removal device with the flue gas, are removed and collected, and then enter the material mixing and stirring device through the fine particle conveying pipeline.

[0007] To achieve the above purpose, the desulfurization wastewater discharged from the desulfurization device of the present invention enters the desulfurization wastewater concentration device through the desulfurization wastewater conveying pipeline for reduction and concentration. The treated clean flue gas is discharged into the atmosphere through the clean flue gas outlet flue.

[0008] In order to achieve the above purpose, the boiler ash produced by boiler combustion enters the material mixing and stirring device through the boiler ash conveying pipeline.

[0009] In order to achieve the above-mentioned purpose, in the material mixing and stirring device of the present invention, three materials including concentrated desulfurization wastewater concentrate, fine particles including high-calcium carbon-containing fly ash adsorbent for adsorbing organic pollutants and their precursors, and boiler ash are fully mixed and stirred. The calcium components in the high-calcium carbon-containing fly ash react with the acidic components in the desulfurization wastewater concentrate, which can reduce the acidity of the desulfurization wastewater concentrate and reduce the corrosion to subsequent treatment equipment. At the same time, as a highly viscous substance, the desulfurization wastewater concentrate will fully agglomerate and bond fine particles, reduce the probability of its secondary entry into the environment, and fully improve its combustion efficiency in the mixed material circulating fluidized bed incineration device. The materials after being fully mixed and stirred enter the mixed material circulating fluidized bed incineration device through the mixed material conveying pipeline and are completely harmlessly incinerated. The clean flue gas after incineration is discharged into the atmosphere through the clean flue gas outlet flue.

[0010] To achieve the above-mentioned purpose, the material mixing and stirring device of the present invention is connected to the fine particle removal device through a fine particle conveying pipeline, and is connected to the desulfurization wastewater concentration device through a desulfurization wastewater concentrate conveying pipeline, and the boiler ash generated by boiler combustion enters the material mixing and stirring device through the boiler ash conveying pipeline.

[0011] When the adsorbent injection device of the present invention is in operation, the amount of adsorbent injected is 60-95 mg / Nm 3 Select within the range.

[0012] The adsorbent of the present invention is a porous particle with rich specific surface area formed by modified and activated high-calcium fly ash with a certain carbon content, and has both physical and chemical adsorption functions. Its average particle size is about 25μm, and its specific surface area is greater than 50m 2 / g, the calcium oxide content of fly ash is about 7%-8%, and the carbon content of fly ash is about 5%-6%.

[0013] Compared with the prior art, the present invention has the following characteristics.

[0014] (1) Due to the use of the device and method for the harmless coordinated treatment of desulfurized wastewater and organic pollutants, the removal and treatment efficiency of desulfurized wastewater and organic pollutants is high. By using the device and method for the harmless coordinated treatment of industrial flue gas desulfurization wastewater and organic pollutants of the present invention, the complete harmless treatment rate of desulfurized wastewater and organic pollutants is ≥99%, and the removal efficiency of organic pollutants is ≥95%.

[0015] (2) Since the high-calcium carbon-containing adsorbent used is made of high-calcium fly ash with a certain carbon content as a carrier, the operating cost is low.

[0016] (3) The present invention has a compact structure and is easy to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 It is the main cross-sectional schematic diagram of the patent of the present invention.

[0019] In the figure: 1. boiler, 2. high-temperature flue at the rear of the boiler, 3. adsorbent injection device, 4. primary dust removal device, 5. fine particle removal device, 6. desulfurization device, 7. clean flue gas outlet flue, 8. boiler ash conveying pipeline, 9. fine particle conveying pipeline, 10. desulfurization wastewater conveying pipeline, 11. desulfurization wastewater concentration device, 12. desulfurization wastewater concentrate conveying pipeline, 13. material mixing and stirring device, 14. mixed material conveying pipeline, 15. mixed material circulating fluidized bed incineration device. DETAILED DESCRIPTION

[0020] exist Figure 1 An adsorbent injection device (3), a primary dust removal device (4), a fine particle removal device (5) and a desulfurization device (6) are sequentially arranged along the airflow direction. The material mixing and stirring device (13) is connected to the fine particle removal device (5) through a fine particle conveying pipeline (9), connected to the desulfurization wastewater concentration device (11) through a desulfurization wastewater concentrate conveying pipeline (12), connected to the boiler (1) through a boiler ash conveying pipeline (8), and connected to a mixed material circulating fluidized bed incineration device (15) through a mixed material conveying pipeline (14). The desulfurization wastewater concentration device (11) is connected to the desulfurization device (6) through a desulfurization wastewater conveying pipeline (10).

[0021] When the device and method of the present invention are in working state, the activated and modified high-calcium carbon-containing fly ash adsorbent is sprayed into the high-temperature flue (2) at the tail of the boiler through the adsorbent injection device (3), and the adsorbent is evenly dispersed in the flue gas. The ultra-fine pores, metal oxide catalytic sites, etc. rich in the adsorbent play a strong physical and chemical adsorption effect on organic pollutants and their precursors in the high-temperature flue gas. The boiler ash produced by the combustion of the boiler (1) enters the material mixing and stirring device (13) through the boiler ash conveying pipeline (8), the desulfurized desulfurized wastewater concentrate enters the material mixing and stirring device (13) through the desulfurized wastewater concentrate conveying pipeline (12), and fine particles including high-calcium carbon-containing fly ash enter the material mixing and stirring device (13) through the fine particle conveying pipeline (9). In the material mixing and stirring device (13), the concentrated desulfurized wastewater concentrate, fine particles including high-calcium carbon-containing fly ash adsorbent for adsorbing organic pollutants and their precursors, and boiler ash are fully mixed and stirred. The calcium components in the high-calcium carbon-containing fly ash react with the acidic components in the desulfurized wastewater concentrate, which can reduce the acidity of the desulfurized wastewater concentrate and reduce the corrosion to subsequent treatment equipment. At the same time, the desulfurized wastewater concentrate, as a highly viscous material, will fully agglomerate and bond fine particles, reduce the probability of their secondary entry into the environment, and fully improve their combustion efficiency in the mixed material circulating fluidized bed incineration device (15). The fully mixed and stirred materials enter the mixed material circulating fluidized bed incineration device (15) through the mixed material conveying pipeline (14) and are completely harmlessly incinerated. The treated clean flue gas is discharged into the atmosphere through the clean flue gas outlet flue (7).

[0022] The above is only a specific implementation of the present invention, and the technical features of the present invention are not limited thereto. Any changes or modifications made by technicians in the field of the present invention should be included in the patent scope of the present invention.

Claims

1. A device for the coordinated treatment of flue gas desulfurization wastewater and organic pollutants, comprising an adsorbent injection device, a primary dust removal device, a fine particle removal device, a desulfurization device, a desulfurization wastewater concentration device, a material mixing and stirring device and a mixed material circulating fluidized bed incineration device, characterized in that: An adsorbent injection device, a primary dust removal device, a fine particle removal device and a desulfurization device are sequentially arranged along the air flow direction; the material mixing and stirring device is connected to the fine particle removal device through a fine particle conveying pipeline, is connected to the desulfurization wastewater concentration device through a desulfurization wastewater concentrate conveying pipeline, is connected to the boiler through a boiler ash conveying pipeline, is connected to a mixed material circulating fluidized bed incineration device through a mixed material conveying pipeline, and the desulfurization wastewater concentration device is connected to the desulfurization device through a desulfurization wastewater conveying pipeline.

2. The device for co-processing flue gas desulfurization wastewater and organic pollutants according to claim 1 is characterized in that: The adsorbent injected by the adsorbent injection device is a porous particle with rich specific surface area formed by activated and modified high-calcium carbon-containing fly ash. It has a strong physical and chemical adsorption function, with an average particle size of about 25μm and a specific surface area of ​​>50m 2 / g, the calcium oxide content of fly ash is 7%-8%, and the carbon content of fly ash is 5%-6%.

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